Specifications: The discs come in a weight range of: 5kg, 10kg, 15kg, 20kg, 25kg. The discs have a full 2-year commercial warranty. The Primal Strength Hi-Temp Grain Bumper Plates are our most popular bumper plates for CrossFit boxes. The grain bumpers have Olympic colour coded flecks and look superb in any gym. The bumpers are 450mm diameter and they are tolerance tested to under 2% of displayed weight. The lower durometer achieved from using grain rubber allows the bumper to have a higher bounce and the plates to be repeatedly dropped from overhead, whilst protecting the Olympic bar and flooring. The Hi-Temp Grain Bumper plates have a smooth, brushed-steel centre with rounded edges, which allow the discs to easily slide on and off the Olympic bars without damaging the sleeves. To further protect the bars, the steel centres are enclosed so they do not touch when loaded together, this also protects the integrity of the discs, even when dropped. The grain rubber is completely odourless