Heavy duty premium polyurethane VULKOLLAN® firmly bonded to precision machined cast iron centre offer low rolling resistance, smooth and noiseless running. Non marking and floor protective. High abrasion and cut resistance. Elastic recover to round shape after static load. Resistant to oils, fats and arange of chemicals. PU has high resistance against picking up cutting, gravel etc. Hardness : Shore A 92±3. Temperature : -30°C to 80°C