Use rubber material for integral molding; mute, wear-resistant, with double bearings for flexible rotation and high weight capacity. New and high-quality replacement wheels for suitcase, roller skate, caster board, scooter, compatible with 45mm wheel fitting. Operates quietly, anti-abrasive, shock-absorbing. Size: OD 50 x W18mm (1.97in x 0.71in); Standard center bearing ID - 6mm (0.24in); Axles 30mm (1.18in) and 35mm (1.38in). Easy installation: 1. Use a hacksaw to cut off the pole connecting the wheels. 2. Install new wheels using 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.