Features: Premium Material: Anti-slip, wear-resistant rubber material and heavy duty, metal wheels. Provide the necessary safety and stability. Training Wheels: This pair of stabilizers assist young learners until they have developed a usable sense of balance on the bicycle. Great for Kids: These training wheels will ensure the security and stability which is necessary in the first ride training on the bike. Gives children the best start to develop their balance and confidence without holding the back of the saddle. Wide Application: Different size optional. Suitable for Children's bicycles of 12andquot or 14andquot or 16andquot or 18andquot or 20andquot . Customer Service: If you confront any problems about our products, please feel free to , we are ready to help. We will solve your problems as soon as possible. Specification: Material: Metal, plastic and rubber Wheel diameter: 11cm Feet pole size: 2.8x9x16.5cm Notice: 1. Due to different monitors and lighting effects, the actual color may be slightly different from the image 2. Due to manual measurement, please allow 1-3cm deviation. Include: 2×Screws 2×Washers 2×Counter Nuts 2×Washers Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.