Rowiz 4PCS 1:10 RC Buggy Hex 12mm Concentric Circle Wheels Rubber Tires Black Suitable for RC 1:10 Off-road car, electric cars Tyres are made of rubber,with gravel pattern and foam inside. Wheel rims are made of plastic,perfect replacement for your kit Tire Outer Diameter: 94mm/3.7"; Width: 36.5mm/1.44" Wheel Drive Hex: 12mm/0.47"; Tires ans wheels are assembled, not glued