Features: brand new and high quality The roller rivets are thickened and reinforced, makes the roller rotate at high speed, prevent slip, mute and not easy to friction. The roller is made of synthetic rubber, which is durable and easy to push and pull. More beautiful, waterproof and oil proof, not affected by sunlight, rain and dust. Suitable for all kinds of furniture cabinets,cribs casters. Soft roll rubber wheel surface guaranteed to leave no mark on carpets or any kind of natural and engineered wood floor, tile floor, specialty floor, and smooth concrete/asphalt floor. Package Includes: 1 x Furniture Crib Caster Specifications: Material:Rubber+Stainless Steel Type:16mm Universal Wheel / 16mm Universal Brake/18mm Universal Wheel / 18mm Universal Brake/20mm Universal Wheel / 20mm Universal Brake/22mm Universal Wheel / 22mm Universal Brake/25mm Universal Wheel / 25mm Universal Brake note: Please allow 0-1mm error due to manual measurement. pls make sure you do not mind before you bid Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you