Description: Made of high-quality ABS, acrylic, smooth sliding, strong load-bearing,durability and high shock absorption. These casters allow you to roll smoothly and quietly without making harsh noises, and ensure that you don't scratch or leave marks on any surface. Adhesive design, installed on the bottom box, no need tools. The rotation of the casters and the precision ball bearings makes smooth and quiet movement. The wheels are suitable for different types of storage box, small cabinet, garbage trush box, tissue box, etc, making it easier to move. Specification: Material: ABS and Acrylics Size Chart: Size: approx. 3x2cm/1.18x0.78inch. Package Includes: 4 Pieces Storage Box Roller Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.