Product details: Material: steel. Colour: blue. Size: wheel diameter 11 cm. Weight: approx. 600 g. Package contents: Vertical stand arm x 2. 2 x auxiliary wheels. 2 x nuts. 2 x washers. 2 x limiting discs. 2 x long screws. Bicycle stabilisers for beginners. Auxiliary wheels are suitable for installation in 12, 14, 16, 18 and 20 inch single speed bicycles, so that children can drive independently and safely and reduce parents’ worries. Butting wheels have been specially designed for beginners and are suitable for cyclists under 100 pounds. They help beginners, develop a sense of balance and confidence when cycling, so that children can learn to cycle faster and enjoy outdoor activities happier!