High Quality Materials: PU leather + sponge + 0.8 wood board (cushion and backrest), no need to worry about the cushion getting wet in rainy days. The PU surface is non-slip and dirt-repellent. Simply wipe the surface with a paper towel. The thickened sponge cushion is very durable and provides children with a comfortable and shock-absorbing ride Easy to Install: The rear bicycle saddle is easy to attach to any rear bicycle frame, you have therefore need a flat and supportive bike frame. The backrest is removable, comfortable and safe Widely Used: Can be used on a standard bicycle rear seat frame and is commonly used for most bicycles, such as hybrid bicycles, touring bicycles, mountain bikes, e-bikes, racing bikes, etc. Attention Please - The large padded seat ensures a comfortable sitting position, for your safety, be sure to have tight screws and checked before riding. Note: A seat rack is not provided. Quality Service: We insist on the quality of our products and customer satisfaction is our top priority. That's why we want to make sure you're completely satisfied with the products you buy. If you have any questions or problems, do not hesitate to contact us!