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Tennis String Review: Tecnifibre X-One Biphase, Black Code, Pro Red Code & More 

Tennis String Review Tecnifibre X-One Biphase, Black Code. Pro Red Code The best way you can improve the playability and comfort of your current tennis racquet is regular and proper restringing with a high quality tennis string. A good rule of thumb is to restring your tennis racquet each year as many times as you play a week. For a 3 time a week player restring at least 3 times a year. It may also be a good idea prior to important tennis tournaments to get your racquet restrung. For a limited time there is special savings on Tecnifibre tennis strings. They are a favorite with many of our customers.

Tecnifibre Tennis Strings Customers Reviews

I find that playing with the 18g really helps my arm. I also recommended those strings to several of my friends and they too mentioned that they have much better control…Candice on the Tecnifibre X-One Biphase String 18g Tennis String (read the full review)” “…I tried the clear set they sent … in my spare Burn 100 Frama and wow, the 17 does not feel soft but plays soft and quite a spin monkey…” Tom on the Tecnifibre Black Code 4s 17g Tennis String (read the full review) “excellent rope, generates power with control and has a great sensitivity for the beats…” Antonio on the Technifibre Black Code 16g Tennis String (read the full review) “One of these softest poly strings that I have tried. It has a great spin potential and it's easier on your arms when compared to other poly strings out there. I use it in combo as a hybrid with the X-one…” Peter on the Technifibre Pro Red Code 17g Tennis String (read the full review) “One of the best string on the market. Very comfortable, great feeling, very close of natural gut. Not very durable, like any multifilament. Go for it !...” Frank on the Technifibre NRG2 16g Tennis String (read the full review) “Love the Tecnifibre Pro Red Code 16G string!! Great feel and suprising duability, which helps to make it a good value. I would never go back to synthetic gut. This string has definitely helped to improve my game, and I would recommend it for serious, heavy hitting players. Also love the red color..” Gunnar on the Technifibre Pro Red Code Reel Size (read the full review)

Tecnifibre Tennis String Review Breakdown

Tecnifibre X-One Biphase String 18g

Tecnifibre X-One Biphase String 18g Tennis String. X-One Biphase is Tecnifibre's premium string. It is designed to take playability and durability to a new level by providing ultimate performance of power and feel, while extending string life by 20% and offering increased spin. X-one Biphase joins together H2C (High Heat Capacity) and NRG microfilaments to acquire this high power and dynamic response. X-One benefits from a process (trimerization), which bonds polyurethane to protect against wear and notching while maintaining high comfort and feel.

Tecnifibre Black Code 4S 17g Tennis String

Black is back with the Tecnifibre Black Code 4S tennis string. The Black Code 4S is a square shaped polyester string designed to have maximum spin and 20% more power than Tecnifibre Pro Red Code. Even though this string does come with more power do not think it cannot last as it has proven to be 15% more durable then its counter part Tecnifibre Black Code, while having the same tension maintenance as Razor Code.

Tecnifibre Black Code 18g Tennis String

The Tecnifibre Black Code Tennis String is a pentagonal polyester string designed to have better elasticity, which delivers more pop, a bigger sweet spot and less shock at impact. The string also has a pentagonal shape for increased spin and feel. It's aimed at frequent string-breakers and can be used as the durability half of a hybrid.

Tecnifibre Pro Red Code 17g Tennis String

Tecnifibre Pro Red Code is suited to the new generation of aggressive player, Tecnifibre Pro Red Code is a new option in the co-polymer/polyester string category. Better tension maintenance and greater comfort than most other polys. Composition is Monofiber high premium copolymer polyester.

Tecnifibre NRG2 16g Tennis String

A maximum power string with decent durability. PU Inside gives 400% elasticity for ultimate comfort and dynamic performance. SPL anti-abrasion coating increases durability. Elastyl Fiber gives 12% more power than standard polyamide. Multi-filament string. Natural Color.

What’s Your View?

Join the tennis conversation on Facebook or Twitter and give your own tennis string review. Or simply call our tennis string specialists at 866-900-3648 to learn about our complete range of tennis strings.

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Shop Do It Tennis for All Your Pro Performance Tennis Gear

Shop Do It Tennis for All Your Pro Performance Tennis Gear



Explore Our Online Tennis Shop

Playing tennis isn’t just a pastime; it’s a lifestyle and an activity that brings excitement to a player’s life at all levels. Whether you’re just learning how to play the sport or competing in professional tournaments, you need equipment that can keep up with you on the court. This is where our collection of performance tennis gear can make all the difference. Do It Tennis is a tennis shop committed to your success in the sport. We’re an online tennis shop run by tennis players, for tennis players, so we know exactly what equipment can take your game to the next level. We offer the best selection and prices on performance tennis gear and accessories. We also have a wide range of pickleball and padel equipment for those interested in those two racquet sports. Browse our online tennis shop today to find the perfect combination of products for your athletic needs.

Tennis Racquets

Shop our huge selection of the best performance tennis racquets on the market featuring all the best-selling frames from all the top brands! Check out the most current technology in Babolat tennis racquets used by Rafael Nadal, Carlos Alcaraz, and Leylah Fernandez; Head tennis racquets, used by Novak Djokovic, Jannik Sinner, Alexander Zverev, Coco Gauff, and Bianca Andreescu; Wilson tennis racquets, used by Aryna Sabalenka, Stefanos Tsitsipas, Ons Jabeur, Alex DeMinaur, Elina Svitolina, Grigor Dimitrov, and many more; Yonex tennis racquets, used by Elena Rybakina, Naomi Osaka, Ben Shelton, Casper Ruud, Jessica Pegula, and Frances Tiafoe ; and Tecnifibre Tennis Racquets, used by Daniil Medvedev and the world’s number one, Iga Swiatek.


For help discovering which tennis racquet is right for your style of play, check out our tennis racquet F.A.Q. page.

Tennis Shoes

Take the wear and tear off of your knees and hips with a brand-new pair of tennis shoes designed for the high-impact nature of tennis. Don’t take just any pair of tennis shoes out on the court. Treat your feet right with tennis shoes made for your style of play. Get the latest technology for injury prevention with a Michelin outsole found in Babolat tennis shoes, the Ortholite Sock Liner found in K-Swiss tennis shoes, the DynaFit Upper found in Asics tennis shoes, the Adaptive lacing system on Adidas tennis shoes, and the Quicklace system specifically designed for Wilson junior shoes.


We also offer an extensive collection of shoes for pickleball, and shoes for padel.

Court Equipment

Do It Tennis carries the industry's largest selection of tennis, pickleball, and padel court equipment. Keeping your court in good condition, all year long, is easy when everything you need is at your fingertips. We sell tennis and pickleball court equipment packages; Har-Tru, Edwards, and Douglas tennis nets and posts, as well as Bakko and Rally Master backboards. For individual training, be sure to check out our selection of Lobster, Sports Tutor, and Playmate tennis ball machines. The Playmate tennis ball mower makes cleanup time a breeze. If you are a professional or want to save money in the long run, you can keep your racquet performing longer and save money with your very own tennis stringing machine.


Building it yourself? Then see our tennis court installation page for more information.

Tennis Bags

Keep it all with you whenever and wherever you need it. Order your new pro bag, 6-pack or tournament bag today! Check out all the latest Rafa, Pure, Evo, and Club Babolat tennis bags; Coco, Pro, Tour, Gravity, Extreme, and Radical, Head tennis bags, the Rackpack and All Vision Tecnifibre tennis bags, Pro and Team Yonex tennis bags; and the Tour, Team, Roland-Garros, US Open, Federer and Advantage Wilson tennis bags.


We also have a large selection of cute tennis bags for women who love to arrive at the court in style. Fashion meets function in these designer tennis bags from cinda b, Ame & Lulu, Cortiglia, Nice Aces and SportsChic.

A Large Selection of Tennis Apparel

It's not just about tennis racquets...

At Do It Tennis, our focus is to help you get the most out of your purchases so that you look and perform your best on the court. We offer a wide array of performance tennis apparel at great prices. The apparel brands we carry offer cutting edge technologies that are designed to provide a dynamic fit, all around protection and superior ventilation. Our women's tennis apparel collection includes women's tennis skirts, tennis shorts, shorties & tights, polos, dresses, tanks and warm-ups. Our men's tennis apparel collection includes tennis polos, tennis shorts, t-shirts, crew neck's, warm-up's and jackets. If you are looking for team tennis uniforms, we offer discounts of up to 20%. You can see our selection and prices in our team section.

For those who are looking for a deals on last season’s tennis apparel, check out our Clearance Sale Section with plenty of discounts on apparel items.

Read our Tennis Blog

Product reviews, tennis how tos, and tournament news

Long gone are the days of walking into your local Pro Shop and discussing each product with the owner. At Do It Tennis our commitment to our customers doesn't stop at checkout. Get the most out of your online shopping experience by visiting our tennis blog for up-to-date information on the latest products written by our team of tennis players who want you to get the right product for you budget, your game and your playing style.

Also found on our blog is a complete list of product videos. Images on the web often lack depth and perception, so our team of professionals endures the lights and camera to explore each product with you, describing the technology, advantages and/or disadvantages as they apply.

We always encourage our customers to participate, leave comments and provide suggestions on our blog, or visit our social media pages to join others in the tennis conversation.

Check Back Often for Promotions

Get great deals and offers on all the best tennis gear

We know that there are many places online to purchase your tennis gear. What makes Do It Tennis stand out from the rest, other than our stellar customer service and our commitment to knowledge is our constantly rotating promotions and offers.

From free shipping to free tennis bags, and 20% off to BOGO, this is your place to see what deals are running right now, what products on sale site-wide and what products have just been released.

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