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 high quality plastic and rubbe. The wheel diameter is 11cm and the thickness is 2.9cm; Suitable for most 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 for beginners.Safe and Stable These rear wheels provide the necessary safety and stability for the children"s first bicycle attempt, and give them a good start with confidence and love for the 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 for a NEW DELIVERY for free. Our products are made with the highest quality materials and are designed to provide you with the best possible user experience. We strive to ship out all orders within three days of purchase, and the estimated delivery time is 8-15 days. When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specifications We want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don''''''''t hesitate to contact us. We are here to help and will do our best to assist you. Thank you for choosing our product. We hope you enjoy it