Included: 2 x wheels, 2 x brackets, 2 x screws, 2 x washers, 2 x screw caps, 2 fixing codes, 1 x wrench; We provide a complete installation tool, so it is easy to quickly install the training wheel on your bicycle.Material: These bicycle training wheels are made of plastic and rubbe. The wheel diameter is 11cm and the thickness is 2.9cm; Suitable Compatible withmost 12 inch to 20 inch single-speed bikes.Thickened design: thicker design makes the wheels more wear-resistant, stable; The high-quality materials used are non-slip and noiseless. It will be safer and more stable Compatible withbeginners.Safe and Stable These rear wheels provide the necessary safety and stability Compatible withthe children's first bicycle attempt, and give them a good start with confidence and love Compatible withthe sport.100% MONEY-BACK GUARANTEE: If you have any concern about this product, you can contact us by email and we will answer you within 24 hours. If the purchase has some quality defect, we offer a 60 days money back guarantee, you can also ask Compatible witha NEW DELIVERY Compatible withfree.