4 stickable swivel wheels free of punching small swivel wheel storage box bottom roller mini stickable pulley Features: Made of high-quality materials, durable and practical Wear resistance: Ball casters are made of high-quality and durable, with great load-bearing capacity. Easy installation: The ball casters are adhesively designed, and the casters can be installed on the bottom box without complicated processes. Quiet and practical: The rotation of the high-quality casters and the precision balls in the shaft make rolling easier. The wheelchair foot inner ring rolls with a smooth surface that will not be blocked by crumbs, hair and sand, and you will enjoy smooth and quiet movement. Shock Absorption: No noise, no scratches. Ball casters have high damping properties. These ball casters allow the box to roll smoothly and quietly without screeching and ensure that the box won't scratch or leave marks on any surface. Wide range of applications: Ball casters are suitable for different types of storage boxes and are easy to move. Specifications: Material: ABS + Stainless Steel Note: Manual measurement, there may be 1-2cm/1-3g error, which is not a quality problem. Due to different screen displays, there may be a color difference between the real object and the picture. Quantity delivered: 4