Wide applications: The ball casters are suitable for different types of storage boxes and make them easy to move. Wear resistance: The ball casters are made of high-quality ABS and stainless steel, durable and characterized by a large load capacity. Easy to install: The ball casters have an adhesive design, the caster can be installed on the bottom box without complicated process. Quiet and practical: The rotation of high-quality casters and the precision ball bearings in the shaft make rolling easier. The internal bearing of the wheelchair foot rolls quickly, the surface is smooth, will not be blocked by crumbs, hair and sand, you will enjoy a smooth and quiet movement. Shock absorption: No noise, no scratches. The ball casters 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 Description Color:4 Pieces Features: Product size: about 1.4 * 2.8 * 4.5cm / 0.55 * 1.10 * 1.77in Packing size: about 18.5 * 8.5cm / 7.28 * 3.35in Weight: about 40G Packing list: 4 * Adhesive ball casters Only the above package content, other products are not included. Notes: 1. Due to differences in camera equipment, light brightness and display screens, the color of the item may be slightly different from the color shown on the picture. 2. Due to manual measurement, please allow a tolerance of 0.1-2 cm.