Our CORTEX Olympic Bumper Plates (V2) are designed for Olympic Lifting, Cross fit, and general gym use. New and improved, they are designed to IWF standards of 450mm and are a lot more dense, come thinner than other comparable bumper plates, meaning you can fit more weight onto the bar. Bumper Plates are encased with in heavy duty rubber and come with inner steel rings. The edges are slightly grooved for better handling. Built to IWF Specifications of 450mm in diameter. Width: 20kg 79mm Designed for Gym, Commercial use or Home use.