Children's Bicycle Stabilizers: Children's safety is the most important. Our bicycle stabilizers weigh 1.1 kg. Heavy-duty training wheels help children maintain balance and provide greater safety and stability. Robust and durable: the upgraded version of thick 3 mm high-strength carbon steel material, 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 to adjust the distance between the vertical support and the ground. Bicycle Stabilizers 18 20 22 24 inches: Bicycle stabilizers are suitable for 18 20 22 24 inch bicycles, covering the needs of children learning to ride in different periods and providing them with safe support. Enjoy the fun of cycling. Compatibility: Bicycle stabilizers are suitable for children's bicycles and variable speed bicycles. Install our special extension screws on the gear shift side. After installation, make sure that the main wheel is perpendicular to the ground, and confirm that the auxiliary wheels on both sides have a height of approx. 0.6-1 cm from the ground. (Installation tools are provided by yourself)