Wide applications: Ball casters are suitable for different types of storage boxes and make them easy to move. Wear resistance: The ball caster is made of high quality ABS and stainless steel, durable and characterized by high load capacity. Easy to Install: The ball caster features adhesive design, the caster can be installed on the bottom box without complicated process. Quiet and Convenient: High-quality caster rotation and precision ball bearings in the shaft make it easy to roll. The internal bearing of the wheelchair foot rolls fast, the surface is smooth, will not be blocked by crumbs, hair and sand, you will enjoy smooth and quiet movement. Shock absorption: no noise, no scratches. Ball castors have high shock absorption performance. These ball casters allow the box to roll smoothly and quietly without making a harsh sound and ensure that the box will not scratch or leave marks on any surface. Product Color: 4 Pieces Features: Material: ABS + 304 stainless steel Product size: about 1.4 * 2.8 * 4.5cm / 0.55 * 1.10 * 1.77in Packing size: about 18.5 * 8.5cm / 7.28 * 3.35inch Weight: about 40G Packing list: 4 * adhesive ball roller Only the contents of the above package, other products are not included. Notes: 1. Due to the difference in camera equipment, light brightness and display screens, the items color may be slightly different from the picture shown. 2. Due to manual measurement, please allow 0.1-2cm tolerance.