Use rubber material for integral molding, providing mute operation, wear resistance, and matched double bearings for flexible rotation and high load capacity. High-quality replacement wheels for suitcases, roller skates, caster boards, and scooters, compatible with 45mm wheel fittings. Features quiet running, anti-abrasive properties, and shock absorption. Size: OD 50mm x W18mm (1.97in x 0.71in); Standard center bearing ID - 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 displays may cause slight color variations between the image and actual item. Measurement error allowed is +/- 1-3cm.