Our kids' training wheel are designed to be universally compatible with a wide range of children's bicycles. The heavy-duty design provides robust support, making them ideal for both standard and electric bikes. These training wheel are ideal for toddlers and young children, helping them develop their riding skills while ensuring their safety. Features -Color:Multi -Material:Carbon Steel, PU -Size: 21.00X11.50X11.00cm/8.25X4.52X4.32in -Improved safety: the kids bike safety trainer wheels are equipped with glow in the dark features to enhance visibility, ensuring your child's safety during evening rides -Convenient setup: these bicycle accessories for kids are designed for easy installation and removal, making it simple for parents to adjust as needed without any special tools -Protective design: the children bike wheels come with a support side guard that provides additional protection, ensuring your child stays safe while learning to ride -Balance support: the training bike wheels are specifically designed to help children develop their balance, making the learning process smoother and more enjoyable - durability: made from stable materials, these professional bike wheels are built to last, providing reliable performance even with frequent use Package list: 2 x pairs of bike side wheels