Large Ceramic Donut Magnet Size 2&frac34;" OD, 1&frac14;" ID, &frac12;" thick. Donut / Ring Shape Ceramic (Ferrite) magnet Size is 2" OD, 1" ID x 1/2" in thickness Non Brittle Ceramic-5 Material, Dark Grey in Color Magnetized Axially through the full thickness Good for Science projects, Mounting, Display bases or as Paper clip traps