Set of 1 Neodymium Magnet 4" OD x 1" ID x 1/2" Thick Ring N48 Rare Earth Size: 4" Outer Diameter x 1" Inner Diameter x 1/2" Thick Ring(101.8mm OD x 25.4 mm ID x 12.7 mm thick) Nickel (Ni) Plated (silver-like shine)Grade: N48 - Extremely powerful magnetic materialPull Force is approximately 146.8 pounds against a 1" steel plate. These rings are axially magnetized, so the strong North/South poles are on the flat sides.That makes them easier to stack into a cylinder than to connect side by side.***WARNING***These are Very Powerful Magnets!Magnets of this size and strength can pull metals objects to them when brought too close.Two magnets of this size will fly together with great force and can easily pinch fingers and skin.DO NOT allow children to play with these magnets. They are simply too strong. NEODYMIUM MAGNETS ARE NOT SAFE FOR CHILDREN
