[Wear Resistance]: The ball caster is made of high-quality durable and featured by great weight-bearing capacity.[Easy to Install]: The ball caster features 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 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.[Wide Applications]: The ball casters are suitable for different types of storage boxes and make them easy to move.size:4.5cmMaterial:Metal + plasticcolour:BeigePackage Contents:48 x Castors WheelsOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.