Features: 1. Every product has a unique Manufacturing Part Number label on the inner package that verifies qualification, including Part Number, Model Number, and inspection date information. 2. If you have any questions about the item, please provide the Manufacturing Part Number for verification. 3. Durable, quiet operation, load-bearing design with double bearings for smooth rotation. 4. Made of high-quality PU rubber, offering durability and noise reduction. 5. Easy to install without the need for complex tools. Specifications: Material: PU Color: Black Size: 9 x 2.6 cm (3.54 x 1.02 inches) (Diameter x Thickness) Load Capacity: 50 kg Inner Bracket Width: Thickness of the new wheel plus bearing Outer Bracket Width: Overall length of the screw Weight: 135 g Package Includes: 1 x Wheels 1 x Screw 1 x Nut 2 x Gasket