Neodymium Ring Magnet - OD100mm x ID70mm x H3mm | N35Magnetic Product Description: This neodymium magnetic ring has an outer diameter of 100mm, an inner diameter of 70mm and a height of 3mm. It is identified by the AMF magnet part number R OD100H3ID70 N35. Uses for our rare earth ring magnets: Naturally occurring, ferromagnetic materials, wide range, north and south pole Large Neodymium ring magnets are not a widely used shape of magnet however they do have unique properties that make them ideal for