Made of rubber material, integrally molded for durability, mute operation, and wear resistance. Equipped with double bearings for smooth and flexible rotation, capable of supporting heavy loads. High-quality replacement wheels suitable for suitcases, roller skates, caster boards, and scooters. Compatible with 45mm wheel fittings. Designed for quiet operation, anti-abrasive performance, and shock absorption. Size: Outer Diameter 50mm x Width 18mm (1.97in x 0.71in). Center Bearing Inner Diameter: 6mm (0.24in). Axle lengths: 30mm (1.18in) and 35mm (1.38in). Easy installation: 1. Use a hacksaw to remove the existing wheel axle. 2. Install the new wheels using the included accessories. Package includes: 4 x 1.97in Wheels 4 x 1.18in Axles 4 x 1.38in Axles 8 x Axle screws 8 x Washers 2 x Wrenches Color: Black Material: Rubber Package Contents: 1 Set x Luggage Replacement Wheels Note: Light reflection and different display settings may cause slight color variations between the image and the actual item. Measurement error allowed within +/- 1-3cm.