The SMAN0803 neodymium arc magnet is made from super strong N52 NdFeB, coated with Nickel as neodymium magnets get oxidized easily. The dimension of this big neodymium magnet is 2” O.R. × 1” I.R. × 1” × 30°, magnetized Magnetized South on the outside face; the weight is about 0.22 lbs. It can pull up about 200 times the weight of steel, 44.5 lbs. The surface field of this item is 6420 gauss, a super high level resulted by high thickness through the magnetic direction.