The force required to push, pull, swivel or maneuver the cart is another important consideration when choosing a caster. Defining specific push/pull requirements will dictate the wheel material that is best suited for the application. This force can be measured using a push/pull force gauge, with pass/fail criteria measured against the probability that a population can successfully push this capacity. It is important to consider this factor to ensure that the caster is easy to use and reduces the risk of worker injury.