1.floater on the water 2.more distance 3.good feeling 4.stabler flying route Polar diameter1.680-1.690" Equatorial diameter1.680-1.690" Weight39.0-40.0gHardness(D)65-75Compressibility(°)75-100Meterialrubber core, surlyn. Exxon surfaceDimple432Shell thickness0.15±0.005" Rebound (71.5%-73.5)Core Dia.1.520-1.530"Core Weight29.00-30.00gDurability300times (125ft/s)