Utilized for the first time in a tennis string, REXIS is made with the super-elastic FORTIMOTM polyurethane material. Utilizing FORTIMOTM, the REXIS tennis string mixes high flex and explosive snapback. As a result, the string boasts increased durability and players experience faster ball speeds.
Naomi Osaka (EZONE DR 98, POLYTOUR PRO 125/REXIS 130) has been using the string since the beginning of the 2017 season and has been pleased with its performance. "The string allows me to get more control on the ball, and it has more pop when I hit,” she commented, praising the new string.
REXIS String Technology
The FORTIMOTM polyurethane material combines flex, repulsion and durability while maintaining a brilliant white color due to its non-yellowing properties. This same polyurethane material is also used in elastomers for automobiles, as well as in medical tubes. The debut of the REXIS string marks the first time the material has ever been used in a tennis string.
FORTIMOTM is fused into the string structure utilizing two innovative manufacturing techniques, resulting in a 4%* increase in ball speed and a 21%* increase in durability. The result is a string that delivers a deep bite and potent power, letting players hit the high-speed shots they’re looking for.
FRF (Fusion of Resin Filament) Process
Utilizing the FRF manufacturing process, gaps between the string’s nylon filaments are completely filled with resin, resulting in a super dense and solid string structure. This lets players experience reduced power loss on their hits.
A plasma bonding process is utilized to fuse the nylon filaments and resin on a molecular level, resulting in increased density and greatly improved durability.
FORTIMOTM is developed by Mitsui Chemicals, Inc.
*Compared to the conventional model, machine tested by Yonex.