10-45lb Crumb Bumper Plate Pairs by Diamond Pro - Recycled Rubber Bumper Plates - for Crossfit, Olympic Lifting, & Strength Training 450mm diameter and a 2in stainless steel insert. Made from recycled rubber and stainless steel insert. Weight / Plate Thickness: 10lb - 1.375", 15lb - 1.875", 25lb - 2.25", 35lb - 3.00", 45lb - 3.75", 55lb - 4.00". American Made Crumb Bumper Plates. Sold in Pairs.