Large Steel Ball for Greater Weight Capacity:Unlike common self adhesive mini caster wheels, our new adhesive wheels use a large 20mm(0.8inch) diameter steel ball in the ABS bracket for effortless and smooth rolling. In addition, each wheel carries 28 pounds. 4 wheels have a total load capacity of 112 pounds, and 8 wheels have a total load capacity of 224 pounds Low Profile Design for Furniture:The compact design of our caster rollers allows for easy installation on the bottom of your small furniture and appliances without affecting the aesthetics. These swivel casters are so versatile that you can mount them on the feet/legs of furniture or appliances such as coffee tables, cabinet, bookshelves, nightstands, planters, air purifiers and more. Tip: These casters can only be used on smooth and hard surfaces and may leave marks on wooden surfaces Steel and Bearings for Smooth Swivel:Our upgraded casters are made of quality metal and thick ABS material, which is sturdy and durable. No