LONGBOARD WHEEL SPECS Diameter:  105mm Width:  62mm Contact Patch:  57mm Style:  Rounded lips with surface skin Bearing Seat:  Offset Formula:  Happy Thane Core: high-strength, high-stiffness, heat-resistant urethane TrypoCore Weight (per wheel): 15 oz / 428 g Durometers:  77a Purchase price includes set of 4 wheels.