Construction: Aerogel/4D Headsize: 500 Sq cm Weight: 135g unstrung Balance: Head Light String Pattern: 14x19 Length: 27" String: M-Fil TS String Tension: 20-30lbs/9-14kgsr * Aerogel"s remarkable characteristics of extreme strength and very light weight (it"s listed in the Guinness Book of World Records for its properties) make it well suited for modern squash racquet technology.