[Sturdy Material]: Bike training wheels for kids are made of high-quality ABS wheels and high-quality metal. Bicycle auxiliary wheels are , non-slip and wear-, providing stability, helping children ride bicycles, and making children enjoy the fun of riding bicycles. [Safe & Auxiliary]: Your children's safety is our top priority. Heavy duty training wheels help beginners to maintain balance and provide greater safety and stability until they learn how to ride a bicycle. Without holding the saddle, you make sure your children's safety. [Universal Size]: Our kids bike universal training wheels suit for 12 14 16 18 20 inch children's bicycles, which meets the needs of children to learn to ride when they grow up. Please check whether these wheels are compatible with your bicycle. [Flash Design]: Our toddler training wheels are non-slip and noise-free. Especially with the flash function, children are more interested in riding at night. Bicycle stabilizer wheels are great helpers for your child's first bike class! [Easy to Install]: By two wrenches to install the training 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: Before riding, please check whether these auxiliary wheels are tightened. colour: blue Material: ABS+metal Package Contents: 4 x auxiliary wheels 4 x vertical bracket 4 x bolts 4 x nuts 4 x washers 4 x gasket Only the above package content, other products are not included. Note: Light reflection 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.