High Quality Materials:High quality plastic and metal training wheels provide extra stability and safety to keep your child safe. Size And Color:The training wheel size we provide is 30.4*18*5.1cm/ 11.96*7.08*2in,pink. Suitable for bikes with 12-20 inch wheels. You can adjust its size to better fit your child's bike. Good Performance: The high-performance rear support wheel provides the safety and stability you need for your first test drive. Making your child drive more confidently is the best way to build confidence. Provide Equipment:We have coordinated auxiliary wheel accessories. You just need to push the wheels according to our installation method, and you can use it safely. Safety Partner:The auxiliary wheel can help children learn to ride more safely , the choice of beginners. At the same time, parents can also be freed from their worries and needs. Simple installation method, parents can easily install, give children a happy childhood!