Package Contents: 2 x training wheels, 2 x axle screws, 2 x nuts, 2 x washers, 2 x lock nuts, 2 x handrails, 1 x wrench. Highest Quality: Our bicycle training wheels are made from high-quality metal, plastic, and rubber. Unique Design: This training bike features a sturdy small stand that makes it easier for young riders to maintain balance. High-Quality Flash Tire: Non-slip, wear-resistant, stable with 3.0mm thickness for enhanced safety. Black wheels perfectly match any colorful bicycle. Universal and Adjustable: Fits 12/14/16/18/20 inch single-speed bicycles with horizontal fork ends. Does not fit semi-horizontal or vertical dropouts. Description: 1. Product Packaging: 2 x training wheels, 2 x axle screws, 2 x nuts, 2 x washers, 2 x lock nuts, 2 x handrails, 1 x wrench. 2. Super High Quality: Our bicycle training wheels are crafted from premium metal, plastic, and rubber materials. 3. Unique Design: We prioritize our customers' safety. The training bike includes a small stand for increased stability, helping young riders gain confidence until they master balance, so you don't need to worry about your child's safety. 4. High-Quality Flash Tire: Non-slip, wear-resistant, and stable, with a 3.0mm thickness for added safety. The black wheels complement any colorful bicycle. 5. UNIVERSAL AND ADJUSTABLE: The training wheels are suitable for 12/14/16/18/20 inch single-speed bicycles with rear horizontal fork ends, but not for those with semi-horizontal or vertical dropouts. Specification: Material: Steel stay and rubber band Color: Black Includes children's bicycle wheels: - 2* Training Wheels - 2* Flange Screws - 2* Nuts - 2* Washers - 2* Lock Nuts - 2* Handrails - 1* Wrench Note: * Bicycle training wheels are ideal for beginners, providing enhanced safety and stability. * Bicycles are a significant childhood gift, fostering motor skills, coordination, and improving balance. Suitable for leisure, family, and children to enjoy beautiful and unforgettable moments together.