Bike wheel, also known as the bike stabilizer, it is a good helper for beginners to reduce their fear and gradually learn to keep their bike balance. This bike wheel is made of rubber and iron material, for beginners, it will , more stable, light weight and it is very unique because of flashing design Features -Color:Black -Material:Rubber, iron -Size:11.00X11.00X2.00cm/4.32X4.32X0.79in -Application: Compatible with 12 inch, 14 inch, 16 inch, 18 inch, 20 inch bike -The wheels made with a thickened design that adds unprecedented stability and safety. -Easy to install, includes everything you need to install, suitable for 12-20 inch children's bikes. -The overall wheels are thicker, stronger and easier to install than regular wheels. -The luminous design of our wheels children more interested in outdoor sports. -Effectively help your child learn to ride a bike, improving your child's safety and confidence. Package list: 2 x shoulder bolts 2 2 x vertical brackets 2 x washers 2 x nuts 2 x spacers 1 x wrench