Product Description: 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 16-24 inch wheels.< br>Specification:Material: Steel or plastic.Color: Black, gray (optional).Size:23 x10x 6cm.Package included: 1 pair of bicycle auxiliary wheels Note: .1. Due to manual measurement, please allow a small error. Please make sure you don't mind before bidding 2. Colors may vary depending on the display. Please understand Note: Hello, please pay attention to your shipping address when purchasing products. If your receipt information (such as name, street, house number, doorbell or email without name, etc.) is incorrect, the order will not be delivered correctly