The SMCN0313 cylinder neodymium magnet is made from high-performance N42 NdFeB, with Nickel coating. The dimension of this item is 1/4″ dia. × 1″ thick, magnetized diametrical, with the tolerance of ±0.004″ × ±0.004″. The weight of this super strong neodymium magnet is 0.0133125 lbs. It can pull up to 9.38 lbs steel. And the surface field is up to 6698 gausses.