... weight in designing devices4Mostly an iron based alloy, NdFeB type rare earth magnet is much more prone to surface oxidation or rust ... rare earth magnet7Irreversible loss at high temperature8Types: N30, N33, N35, N38, N40, N42, N30M, N33M, N35M, N38M, N40M, N27H, N30H, ... N35H, N37H, N27SH, N30SH, N33SH, N35SH, N25UH, N28UH, N30UH, N35SH, N38, N45, N48 and N509High energy ranging from 8MGOe to 48MGOe ...