Dimensions: 5" x 1 1/2" (125 x 38mm) Load capacity: 400 pounds (181 kg) Aluminum core, light and resistant. Polyurethane injected tread bonded to the aluminum core using the Inter Lock System. Provide good floor protection. Non-marking. Withstand atmospheric agents, oils, greases, hydro carburates, sugar and salt. Abrasion resistance. Ball bearings to facilitate start up.