ShareGoo 12mm Hex White 5 Spoke Plastic Wheel Rims and Rubber Tires for HSP HPI RC 1:10 On Road Racing Car (Pack of 4) Fish Pattern Tyres are made of rubber ,with sponge inside. Fits for RC 1: 10 on-road Racing car, drift, touring car... Tire OD: 65mm,Tire ID: 45mm Hexagon coupling: 12mm Note: The tyres and wheel rims are separated,Hexagon coupling: 12mm you need to assemble and glue them together by yourself.