The Tecnifibre NRG2 17 1.24 660' Reel tennis string is designed for maximum power with maximum feel through PU and Elastyl® fibers with an SPL coating. This string uses PU (the same material used for cushioning in your shoes) to dampen shock for a soft. comfortable feel. Whether you suffer from arm pain or you're just looking for a powerful. playable string. the Tecnifibre NRG2 17 1.24 660' Reel is a must-try.

• The 17 gauge is thinner for an improved feel.
• PU inside has 400% elasticity for ultimate comfort and dynamic performance.
• Multifilament Synthetic string.