16 Pack - Self-Adhesive Caster Wheels, Ball Transfer Unit Universal Rotating Ball Wheel for Under Bed Storage Rack, Trash Can, Bed Storage Box Attach the 360° freely rotating ball transfer units to the underside of items for effortless movement. The wheels are quiet and stable, ensuring they won't scratch your floor. 2 Mounting Methods for Transfer Wheels with Adhesive: You can choose to stick them on or fix them to the underside with screws, depending on the item type. Single pulley can bear a load capacity of 20 pounds. Four rollers together provide a maximum load capacity of 80 pounds. These self-adhesive wheels are suitable for trash cans, storage boxes, and small containers, and are also a great DIY accessory. Ideal for crafts, children's toys, and more. Sturdy and Durable, made from high-quality ABS and high-strength stainless steel. Features good wear resistance and is not easily worn out.