ADJUSTABLE TRAINING WHEELS-The cycling training wheels on the bike are suitable for 12-14-16-18-20 inch children's bicycles. Easy to install, and the elongated holes are more convenient to adjust, effectively avoiding the rear tires vacating, and increasing the support of the auxiliary wheels. MUTE FLASH WHEELS-The bicycle training flash wheels have a magnetic flash, no battery, a self-generating inner core, turning light. The kid's support wheels not only can improve children's interest in learning but also the flash wheel can remind passing vehicles and pedestrians to avoid and ensure safety. SUITABLE FOR BEGINNERS-Tour bicycle steel frame gives enough flexibility to help children learn to ride a bicycle more safely, the choice for beginners. These support wheels bracket arms work only with hub gears. Not compatible with the gear-shifted bike, bikes with derailleurs. STURDY STRUCTURE-Reinforced clips are added to the kid's bike stabilizers to create a sturdy triangular design to prevent rollover and deformation of the bracket, and increase the sense of balance. High-density wear-resistant bearings, buffer shock absorption, and more durable safety performance. DURABLE MATERIAL-The child's bicycle stabilizer bracket is made of thickened steel, which is strong, durable, and strengthens the load-bearing. The cycling training wheels' surface features PU, which is quiet and wear-resistant and has a long service life.