Pulley Plastic Gears toy wheels concave dia.29mm TH= 5.8mm Aperture: 3.9mm*FD254 Product Description DIY Plastic Pulley wheel toy wheels small flywheel concave static pulley RED NEW Features Material: plastic 100% Brand New Diameter: 29mm Thickness: 5.8mm Aperture: 3.9mm Package 20PCS X Plastic Pulley