Ektelon 2014 O3 Tour 165 Racquet Power Level: 3500 Balance: Even; Head Size: 106; Cross Section: SW 23mm SB Grip: Maxtack; String Type: Lightning 17; String Tension: 34+/-4; Material: GraphitXtreme with Carbon Kevlar No warranty on replaceable items, especially string. Warranties must be addressed directly to the manufacturer and not the distributor (Amazon seller)