Hi Temp Bumper plates 100kg pack (High Impact Crumb Rubber)The Mac Strength rubber crumb bumper plate has the ideal durometer rating to absorb bounce and shock, preventing damage to your olympic lifting bar. Crumb Rubber technology dissipates the impact and reduces the stress on the lifting bars. On the field tests have shown Crumb Rubber Bumpers bounce less than other high end rubber bumper plates on the market. Less bounce equals less shock and less noise. Olympic fitting centre ring 100kg pack consists of