"The string offers so much ball bite, it will rip the felt off the ball!"

Rated #  1 in SPIN for 3 years (stringforum.net). T1-Firewire, a triangular shaped, new-generation, monofilament string, offers one of the best ball bites and spin potentials in the string industry. Solid durability and exceptional tension stability makes this string the front runner for the competitive weekend warrior.

Who should try the string?

  • Players who are used to playing with polyester strings.
  • Players who are looking for extreme ball bite.
  • Playing level: LK: 17-1, 3.5-7.0 NTRP, college players, ITF players, etc... (advanced - high performance level), UTR 5-16+
  • High level junior players from age 12 -15.

  String Characteristics:





Tension Stability

Spin Potential


  String Specifications:

String Name: T1-Firewire

Gauges: 16g (1.30mm). 17g (1.25mm), 18g (1.20mm)

Length: Sets: 12.2mm/40ft, Reels: 200m/656ft


Official Product Reviews:

The greatest string for spin!

"I am using this string for more than a year and will not change it. Gives great spin on my shots. Good price for a quality product."


Five Stars

"My favorite tennis string for me. Great topspin and tension. Use for Head prestige mid plus"

J. Halseth

Great String! As a former D-I college player...

"Great string! As a former D-I collegiate player and now having a highly ranked juniors son, we both are playing competitively with T1-Firewire. Definitely worth giving this string a shot. We did... and now it is the string in all of our rackets."


Let's get geeky!

Small business does not mean lesser quality!

Lack of tension stability & high string stiffness are often the 2 biggest disadvantages when considering playing a co-polyester string.

Our production team was able to develop a co-polyester compound that is superior in tension stability and string stiffness (arm-friendliness) to most co-polyester strings in the tennis industry. Here is a comparison to some of the most used strings in the industry.

(Stiffness: The higher the number the more stiff the string. Tension Loss: The lower the number the better the string held its tension!)

Tier One Sports:

  • T1- Firewire 1.25mm: String Stiffness: 221 (lbs/in), Tension Stability: 13.85 (lbs)


  • Babolat RPM Blast 1.26mm: Stiffness: 273 (lbs/in), Tension Loss: 17.13 (lbs)
  • Luxilon Alu Power 1.25mm: Stiffness: 242 (lbs/in), Tension Loss: 17.13 (lbs)
  • Head Lynx Edge 1.25mm: Stiffness: 181 (lbs/in), Tension Loss: 21.59 (lbs)
  • Yonex Poly Tour Spin 1.25mm: Stiffness: 212 (lbs/in), Tension Loss: 15.41(lbs)
  • Tecnifibre Black Code 4 1.22mm: Stiffness: 199 (lbs/in), Tension Loss: 17.42 (lbs)
  • MSV Focus-Hex 1.27mm: Stiffness: 220 (lbs/in), Tension Loss: 16.45 (lbs)
  • Luxilon 4g 1.24mm: Stiffness: 249 (lbs/in), Tension Loss: 13.30 (lbs)