IronMan Olympic bumper plates have a standard 45cm diameter across the complete weight range and are made from environmentally friendly cast iron that is coated with a thick durable hard rubber to protect flooring making them ideal for crossfitters and others who are constantly pushing their limits & PB's. Bumper plates are designed to be dropped from significant heights the rubber helps to absorb the shock when the bar is dropped. And because the weight plates are all the same size they can share the impact as well as balance the weight load when resting on the floor. NOTE care must be taken with lighter weights to reduce the risk of them tacoing. These are the massive weight plates and barbell you see on the TV when you're watching the professional weightlifters lift those awesome weights those very large weights are Olympic sized weights and that's exactly what your buying here the big Olympic weight plates and Olympic sized barbell to go with it you get the following weight plates