Tecnifibre NRG2 17 124mm provides more bite on the ball with more power while maintaining the feel of the 16 gauge version Utilizing their Elastyl fibers which give 12 more power than standard synthetic string materials throughout this multifilament strings leads to a more elastic string giving easy power and a comfortable feel NRG2 features the SPL technology Silicium Pyrogene Lubritec an abrasion resistant coating to increase the durability Tecnifibres PU Inside technology to bind the multifilament fibers together provides up to 400 elasticity for the ultimate comfortable feel for touch shots A perfect combination for the player seeking a string with power and comfort Also check out the line of Tourinspired Tecnifibre racquetsConstruction Multifilament polyamideColor NaturalGauge 124mm