[Sturdy Material]: Bike wheels are made of high-quality ABS wheels and high-quality metal. Bicycle auxiliary wheels are durable, non- and wear-resistant, providing stability, helping children bicycles, and making children enjoy the of bicycles. [Safe & Auxiliary]: Your children's safety is top priority. Heavy duty wheels help beginners to maintain balance and greater safety and stability until they learn how to a bicycle. Without holding the saddle, you will make your children's safety. [Universal Size]: kids bike universal wheels suit for 12 14 16 18 20 inch children's bicycles, which meets the needs of children to learn to when they grow up. check whether these wheels are compatible with your bicycle. [Flash Design]: toddler wheels are non- and noise-free. Especially with the flash function, children are more interested in at night. Bicycle stabilizer wheels are great helpers for your child's first bike class [Easy to Install]: By two wrenches to install the wheel on the rear wheel of the children's bicycle, and you can adjust the distance of the vertical bracket from the ground. Specifications: Wheels Size: 11 x 2.5 cm Vertical Bracket Arms Height: 22 cm Attention: , check whether these auxiliary wheels are tightened. colour: blue Material: ABS+metal Package Contents: 2 x auxiliary wheels 2 x vertical bracket 2 x 2 x nuts 2 x 2 x gasket Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.