Bike Training Wheels for 12 14 16 18 20 inch Variable Speed and Single Speed Kids Bike. Extension Bolts are included to solve the problem of installing training wheels on bicycles with short rear axles. The training wheels are easy to install and remove, allowing parents to adjust the height as their child grows. The wheels are equipped with rubber tires that provide a smooth and comfortable ride. The training wheels feature a sturdy frame designed to withstand the weight and impact of outdoor use, offering a stable and secure ride. Crafted with high-quality rubber materials, these bicycle training wheels are slip-resistant and wear-resistant, ensuring a stable riding experience for children. These training wheels are popular with both boys and girls and make a great gift for kids. Color: Black. Material: Iron + Rubber. Package Contents: 2 x Screw, 2 x Side Wheel. Note: Only the items listed are included. Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the actual product. Measurement may vary by +/- 1-3 cm.