400 KG Maximum Capacity Extremely sturdy steel construction , for high load up to 100 KG per castor. * 4 caster set-up equals 400 KG max. capacity (Warning: Do not use overload, it will cause damage or shorten the use time) | 360° Free Rotation Upper and lower raceways are filled with high-quality swivel bearings. This enables the caster to rotate 360 degrees smoothly, swiftly, and silently, you can adjust the furniture to the direction you want. | Smooth and Non-Marking PVC material is used for the periphery of the wheel, silent and wear-resistant, reinforced bearing is used, with stronger bearing capacity and wide application range, cement floor, wooden floor, marble, carpet, etc |