The black rubber weight plates are perfectly suited for weightlifting, powerlifting, and other strength training exercises. The weight plates are standardized according to the International Weightlifting Federation (IWF) guidelines, which means that the diameter of each weight plate is 50 mm. This refers to the size of the plate and the inner ring, which is made of stainless steel. The solid rubber of our SUPRFIT plates absorbs shocks and is specifically designed for dropping from high heights. The shock-absorbing properties of the plates help prevent them from bouncing around excessively.