Set of 10 magnets Size: 10mm diameter x 5mm thick Material: Neodymium (NdFeB) Grade: N48 Coating: Nickel Magnetization: Axially Pull Force: ~ 7.6 pounds SKU# M10x5MMDI The strong North/South poles are on the flat sides, meaning they are easier to stack into a cylinder than connect side by side NEODYMIUM MAGNETS ARE NOT SAFE FOR CHILDREN