Trans-formaTM combines the best of both worlds; like hard tread wheels, they are exceptionally durable and roll easily. Like soft wheels, Trans-formaTM glides quietly, protects floors, and resists impact with a cushion ride.
What's more, the wheels really stand up to the test, rejecting floor debris like metal shavings. And non-marking, thermoplastic elastomer tread is chemically bonded to an ultra-tough, waffle design polyolefin wheel core. Combines the rolling and swiveling ease of a hard tread wheel with the smooth, quiet ride of a hard tread wheel.