Description: - 【Universal Compatibility】: Designed for children's balance bikes, wheel bearing cover is suitable for front and rear wheel installation - 【Easy Installation】: Its universal structure of the kids balance bike wheel axle cover ensures easy replacement. Non professionals can also easily get started - 【Quality Material】: Made of quality metal and PP materials, balance bike wheel hub axle cover ensures smoother and more stable sliding - 【Protective Cover】: Equipped with a standard sized axle cover, bike axle bearing lid effectively prevents dust and moisture from entering, significantly extending the service life of the components - 【Lightweight Design】: This balance bike accessories set is great for daily sliding and training, and will not add extra weight to your child's riding Specification: - Material:Metal PP Size Chart: Optional: Cap diameter: 5.8cm/2.28inch Hole diameter:0.8cm/0.31inch OR Cap diameter: 5.8cm/2.28inch Hole diameter:0.8cm/0.31inch Shaft length: 11.4cm/4.49inch Package Includes: Optional: 2 Foam Wheel Bearing Covers or 2 Foam Wheel Bearing Covers 1 Set Axle or 4 Foam Wheel Bearing Covers or 4 Foam Wheel Bearing Covers 2 Set Axle Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.