Item Type: Bike Training Wheels_x000D_Material: Steel+Plastic_x000D_Weight: Approx. 1069g / 37.7oz_x000D_Load Bearing: Approx. 100kg / 220.5lb 1ADJUSTABLE DESIGN: The training wheel arms have holes on both sides for easy adjustment, you can adjust to different holes to fit your bike size. 2FITS BIKE SIZES: These heavy duty bike training wheels, well made and highly compatible, which are suitable for kids bikes from 18 to 24 inches. 3DURABLE AND LONG LASTING: With high quality steel frame and anti shedding rubber tires, the wheel is durable, wear resistant and has a long service life. 4SUITABLE FOR BEGINNERS: Bicycle assisted training wheel, compact structure, provides more safety and stability for beginners to learn bicycles. 5EASY TO INSTALL: Our bike training wheels attach quickly and easily to your child's bike, helping them learn to ride a bike until they develop a good balance on the bike.