Omni Gym 1
There are three upper wheel assemblies. Each upper wheel assembly has two dough-nut shaped wheels that look like this picture:
Our Upgraded Long Upper Wheel Is Much Stronger:
There are two lower wheel assemblies and the original lower wheel assemblies look like the upper wheel assemblies except with only one of the thin original single bearing dough-nut shaped wheels. Our upgraded wheel is significantly wider and has two strong bearings.