Dunlop Aerogel Rush Hl Squash Racquet Construction: M-Fil/Aerogel Headsize: 525 sq cm Weight: 167g strung Balance: 350mm, Head Heavy Beam: 20-18mm tapered beam String Pattern: 16x19 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. 16x 19 dense string pattern for stability and control Pioneered and designed by Dunlop for hardball doubles squash Widened throat for torsional stability