I have found the econ color bumper plates to not meet the 25 grams weight variance in 6 of 14 plates ordered over two transactions. The worst was 7.4 ounces heavy (207 grams). In my latest transaction Vulcan refuses to replace an underweight plate with the statement "we cannot guarantee the weight variance on the econ color bumpers" This is with their web site still advertising the 25 gram claim. I verified my weight exactly the same by independent UPS scales. They did offer a complete refund.