Children's training Wheels are made of high-quality steel which can bear heavy children without security problems. They are sturdy and durable which can keep bycicle beginner stable and help child learn to ride a bike without fear. This is a good choice of fittings for your children to learn the bike at the first time. Improve your child's safety and confidence. Features - Color: Black.- Size: 11 x 11 x 2.5cm.- Material: Rubber.- Children's training Wheels are made of high-quality steel which can bear heavy children without security problems.- They are sturdy and durable which can keep bycicle beginner stable and help child learn to ride a bike without fear.- This is a good choice of fittings for your children to learn the bike at the first time.- Improve your child's safety and confidence.?Packing list: 1 x Wheel.Items from Sheng Xinshun's shop