Morgan 23.5kg Body & Aerobic Pump Weights SetSolid rubber Tri grip plates allow for multiple uses, allowing the plates not only to be used on the pump bar but also to be used as free weights, solid rubber plates ensures no cracking when being dropped, compared to cheaper plastic plates that will crack after some use. This 23. 5kg morgan aerobic pump set is designed to be used in a commercial environment, using a solid steel bar and solid rubber plates, there is no risk of the plates cracking or