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.Security: 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.Good stability: The heavy-duty rear wheel stand is a great tool for kids to maintain safety and stability for the first test drive. The best start for your child to achieve two-wheel balance and confidence.Easy to install: easy to install.le for 18 22 inch wheel bikes.After-sales service: 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-Minnanxin