For Those About To Rock The Dirty Deed features Corrugated Technology, a revolutionary new throat design that optimizes power and the Power Stabilizer, Head's patented twin tube construction that provides maximum stability.Vendor Sku 226020 SportRacquetball Headsize106 Length22 Beam Width21mm Weight Strung195g6.8 oz ColorsGoldBlackGreen CompositionConstructionMicrogelMetallix String PatternMains X Crosses16x16 Recommended String Tension31 37 lbs. Grommet TechnologyIGS2 Frame TechnologyCT Technology, Power Stabilizer Grip TypeHydrosorb Manuf. Recommended StringMegablast