2 pack of small pulleys (8 pieces)High-quality casters: Made of sturdy ABS material, wear- and durable, long-term ownership, two-wheel design makes it more stable. When 4 wheels are used at the same time, it can bear up to 22lbs/10kg, which is more labor-saving and convenient to move.Plastic casters are widely used: plastic container wheels are suitable for tissue boxes, pallet containers, cloth buckets, small furniture, sorting boxes, trash cans, mobile cartons and adapt to any storage boxEasy to install and use: the movable wheel with glue design, installed on the bottom box, no complicated process, no punching, no glue, self-contained rubber padAdhesive casters for furniture and storage boxes: easy to move or position heavy furniture, no effort is required to move the furniture when cleaning, powerful bearing wheels make the movement more labor-savingSilent wheel: The silent wheel is stable, mini, and silent. It will not scratch the ground and is very stable. These spare casters allow you to roll smoothly and quietly without making harsh noises, and ensure that you will not scratch or leave marks on any surface. Mini size adhesive wheels (4 per pack))