Compatibility: Designed for RoyalBaby kids' bicycles, but compatible with many other standard kids' bikes that utilize similar bottom bracket configurations. Material: High-strength steel with sealed ball bearings Size: Standard size suitable for 12, 14, 16, and 18-inch RoyalBaby bikes Features: Durable Construction: Built from high-strength steel, this bottom bracket ensures longevity and durability, even under frequent use and challenging riding conditions. Smooth Performance: The sealed ball bearings offer smooth rotation and reduce friction, providing a more efficient and comfortable pedaling experience. Weather-Resistant Sealing: Features sealed bearings to protect against dirt, dust, and moisture, ensuring consistent performance and reducing maintenance needs. Universal Fit: Although specifically designed for RoyalBaby bikes, this bottom bracket is compatible with many kids' bike models, making it a versatile replacement option. Safety Note: Ensure proper installation to maintain the bike's performance and safety. Regular inspection and maintenance are recommended to ensure a smooth and reliable riding experience for your child. Ideal For: Parents and bike technicians seeking a reliable replacement for a worn or damaged bottom bracket on a child’s bike, ensuring the bike remains smooth, safe, and easy to ride.