The Jumbo Wheel is for the Jumbo MK2 and MK3 brick machine and specifically the non-swivel wheel as a replacement item. This does not include the brackets which are not expected to be a high-wear item. Previously, testing with rubber wheels, plastic wheels and polyurethane wheels have shown mixed results depending on the quality of the slab and cleanliness of grit on the surface. Currently, the wheels being issued have a thinner, durable coating instead of rubber content. There is a roller ballbearing to facilitate the movement of the machinery across the floor which is strong enough to withstand vibration and expected usage.