[Sturdy Material]: Kids' bike training wheels are made of high-quality ABS plastic and metal. The wheels are non-slip and wear-resistant, providing stability to help children learn to ride bicycles safely and enjoyably. [Safe & Supportive]: Child safety is our top priority. Heavy-duty training wheels assist beginners in maintaining balance, offering enhanced safety and stability until they gain confidence and skill in riding. [Universal Fit]: These training wheels are compatible with 12", 14", 16", 18", and 20" children's bicycles, supporting kids as they grow and learn. Please verify compatibility with your specific bicycle before purchase. [Reflective Design]: The training wheels feature a reflective surface for increased visibility in low-light conditions, helping children feel more confident while riding during dusk or dawn. Stabilizer wheels serve as helpful aids for early cycling practice. [Easy Installation]: Installation requires only two wrenches to attach the training wheels to the rear axle of the child’s bicycle. The vertical bracket height can be adjusted to set the optimal ground clearance. Specifications: Wheel Size: 11 x 2.5 cm Vertical Bracket Height: 22 cm Color: Blue Material: ABS + Metal Package Includes: 2 x training wheels 2 x vertical brackets 2 x bolts 2 x nuts 2 x washers 2 x gaskets Note: Before each use, ensure all components are securely tightened. Colors may vary slightly due to screen settings. Measurements are subject to a tolerance of ±1–3 cm.