Set of 50 magnets Size: 1/4" diameter x 1/8" thick. (6.4 mm x 3.2 mm) Material: Neodymium (NdFeB) Grade: N48 Coating: Nickel Magnetization: Axially Pull Force: ~ 3.1 pounds SKU# M14x18DI The strong North/South poles are on the flat sides, meaning they are easier to stack into a cylinder than connect side by side