STLC3-4PACK: Four rubberized polyurethane 3 casters, two with foot lever brakes included SUPERIOR QUALITY: High-quality stainless stand, enhanced steel column and plate enables four caster wheels to withstand up to 396 lbs NOISE-FREE CASTERS: Made with polyurethane tread that helps reduce noise-causing vibration for a smooth and quiet performance that wont leave any damage or marks on the floor VERSATILE APPLICATION: Perfect caster system for studio rack cases, home furniture and much more