Wear-resistant, thickened wheel design: Bicycle training wheels are made of high quality plastic and rubber. Includes everything needed to install wheels on a bicycle with 18-22 inch wheels.<br> Safety: Our bicycle wheels are made of high quality metal, plastic materials and rubber. They are non-slip and noiseless, so your child can ride more safely and smoothly.<br> Good stability: The sturdy wheel rear wheel stand is a great tool for children to maintain safety and stability for the first test drive. The best start for your child to achieve balance and stability. confidence of two wheels.<br> Easy to install: easy to install.Suitable for bicycles with 18-22 inch wheels.<br> Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store