Anti-slip and noiseless - Our bike training wheels are made of high quality PU, which makes them sturdy for a longer service life. Anti-slip, wear-resistant, lightweight and quiet. Adjustable size - These bicycle training wheels are suitable for 12, 14, 16, 18, 20 inch children's bikes, you have more than choice to adjust the height. Safety and Stability - This bike training wheel set provides the safety and stability needed until young learners have developed a usable sense of balance on the bike. The best way for your kids to gain balance and confidence. Easy to install - We provide complete installation accessories, you have more options to adjust the height, so it's easy for you to quickly install the training wheel on your bike. Package included - Training wheels for bike included 2 x wheels, 2 x support, 2 x support washers, 2 x bolt, 2 x nut, 2 x screw washers.