These "pancake style" weight plates are made from cast iron and after casting, their outer edges are fully machined, leaving a smooth rounded edge that is safe for both the user and the floor. They fit onto any 1-inch diameter barbell or dumbbell handle. The weight plates are coated with a durable resin-based paint and baked for one hour to ensure the finish is chip-proof, abrasion-resistant and corrosion-resistant. This finish is more scratch-resistant than the same style of chalkboard we have, and it's much stronger than the baked-on paint everyone else uses. Our products successfully protect against rust and corrosion over many years of daily use and enjoymentOur plates start at an ultra light 1.25 pounds and range all the way up to 50 pounds. Most other brands are limited to just 2.5 to 25. Get ours for greater flexibility and more options.