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Crumb Rubber has the ideal durometer rating to absorb bounce and shock, preventing damage to your olympic lifting bar. Crumb Rubber technology dissipates the impact giving you 10,000 - 30,000 drops and reducing stress on the lifting bars. On the field tests have shown XM Crumb Rubber Bumpers bounce less than other high-end rubber bumper plates on the market. Less bounce equals less shock and less noise.
Weights 10lbs and 15lbs are not designed to be dropped when doing strength training unless combined with heavier weights (25lbs, 35lbs, 45lbs, and 55lbs). Dropping 10lbs or 15lbs plates alone above the hip will result in cracking or breaking. Failure to use properly will void the product warranty.
The 10lbs and 15lbs Xtreme Monkey Crumb Rubber Bumpers are covered under the Xtreme Monkey 100% Satisfaction Guarantee for 6 months from the time of purchase. The 25lbs - 55lbs rubber bumper plates are covered for 3 years from the time of purchase.