1. DOUBLE LARGER WASHER: After optimization, the double carbon steel of the wheel has been tested for quiet and longer life. In addition, we have specially enlarged the washer so that it can cover the whole thing beautifully. Even after your child has driven one, you don't have to worry about sudden falling, which can cause your child to suddenly fall to the ground. Grow up safely and . 2. UNIVERSAL DIAMETER AND AVAILABLE SIZE: Are you still annoyed that bicycle wheels are only suitable for one or sizes of bicycles? That's okay. With a bracket featuring 5 different holes, it can meet your needs excellently to mount it on bicycles with sizes 12, 14, 16, 18, and 20 inches. The round and beautiful appearance fits with each other, like a lollipop, bringing your children a chromatic look. (Note: For variable speed bicycles.) 3. THICKENED WHEEL WITH QUALITY PU MATERIAL: We have been looking for quiet and durable bicycle wheels, especially those that can also play a role in shock absorption. This wheel, made of quality PU material, fits exactly to this bill. The thicker wheel with a thickness of 2.5 cm (0.5 cm thicker than ordinary ones) can reduce bumps and ensure easy handling with less effort and more comfort.