Sturdy Material: Kids bike training wheels are made of high-quality ABS wheels and high-quality metal. Bike training wheels are durable, non-slip and wear-resistant, providing stability, helping kids ride a bike and allowing kids to enjoy the joy of riding a bike. .Safe and helpful: Your kids' safety is our top priority. Heavy duty training wheels help beginners keep their balance and provide greater safety and stability until they learn to ride a bike. Without holding the saddle, you ensure your kids' safety. .Universal size: Our universal kids bike training wheels are suitable for 12 14 16 18 20 inch kids bikes, meeting the needs of kids learning to ride a bike as they grow up. Please check if these wheels are compatible with your bike. .Flash design: Our toddler training wheels are non-slip and noiseless. Especially with the flash function, kids are more interested in riding a bike at night. Bicycle stabilizer wheels are great aids for your child's first cycling class. Easy to install: 20-inch training wheel kit includes two axle bolts, two nuts, two washers, limit spacer, two vertical mounting arms and two wheels. With two wrenches to install the training wheel on the rear wheel of the children's bike, and you can adjust the distance between the vertical mounting arm and the ground.