Wheels of a series 31 are made of high-quality white polyamide and are intended for movement of freight weighing from 600 to 1500 kg. Used in the food industry: freezers, sausage frames, aggressive environments, also for the ;economical; (due to the solidity of the wheel) transportation of heavy loads in the engineering and construction industries. The temperature of use is -30+80 ° C, for a short time up to +120°С. The ball bearing on the wheel axis provides ease of movement. Of the obvious minuses, noise is when transporting unloaded equipment. The wheel is resistant to shock and abrasion.