Head Sonic Pro String Review

http://www.tennis-warehouse.com/Head_Sonic_Pro_17_Strings/descpageACHEAD-SONIC17.html Made from uniquely refined co-polymer polyester with a soft molecular construction, Sonic Pro string offers excellent control and touch. Though polyester strings are stiffer, durable, and more control-oriented, Sonic Pro is soft-feeling and offers a livelier response.