This is a set of bike training wheels products. They are made of high strength material. The supporting wheels are sturdy and adjustable, providing the necessary safety and stability. It can give your child the best start with two-wheel balance and confidence. Features - Color: Black. - Material: Metal. - Size Wheel: 10.5x10.5cm/ 4.13x4.13 inch. - Size Rack: 6x7x3cm/ 2.36x2.75x1.18 inch. - Made of environmentally friendly high strength material, durable and safe. - Unique designed can give your child the best start with two-wheel balance and confidence. - Perfect bike accessories for those who are not skilled at cycling or afraid of falling. - This is a good choice of fittings for your children to learn the bike at the first time. - Comes with other bike accessories, easy to assemble.