Adjustable bicycle stabilizer for MTB adult and kids bikes 20 inch auxiliary wheelsBicycle Stabilizers Adult Children's Bicycle Variable Speed Mtb Auxiliary Wheel 20 InchWear-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.Suitable for 18 22 inch wheel bikes.After-sales service: We provide 24-hour online service. We provide high-quality bicycle training wheels and satisfactory service, please rest assured to buy