Easy to Install The training wheels are suitable for 12 to 20 inch bicycles and can be adjusted according to the child's bike riding skills and level. The support wheels are individually strong and adjustable, providing the security and stability needed for bicycling. Heavy Duty & Flash Mute Training wheels are built with a structural reinforcement design that makes them sturdy for a longer product life. This set of heavy duty rear wheel stabilizers assists young learners to ride bicycle until they have developed a usable sense of balance on the bicycle. Improve your child's safety and confidence. Light weight, flashing silent wheel to keep you away from the noise. High-Quality Material Our bike training wheels are made of high quality alloy steel and rubber with sturdy metal supports that are slip and wear resistant. Improve your child's safety and confidence without worrying about the backrest of the saddle.