Stabilizers for Kids Bike: Child safety is the most important. Our bike stabilisers weigh 1.1 kg. Heavy-duty training wheels help children maintain balance and provide greater safety and stability. Rugged and durable: the upgraded version features thick 3 mm high-strength carbon steel material for stable riding without deformation. The wheels are made of environmentally friendly PVC material, non-slip, wear-resistant, durable, and low noise. Easy to install: use a wrench to install the training wheel on the rear wheel of the bicycle and adjust the distance between the vertical support and the ground. Bike stabilisers for 18, 20, 22, and 24 inch bicycles: suitable for children's bikes in various sizes, meeting the needs of children learning to ride at different stages and providing safe support. Enjoy the fun of cycling. Compatibility: bike stabilisers are suitable for children's bicycles and variable-speed bicycles. Install the included extension screws on the derailleur side. After installation, ensure the main wheel is perpendicular to the ground, and confirm that the auxiliary wheels on both sides are positioned approximately 0.6–1 cm above the ground. (Installation tools not included)