ndfeb block magnet 1. high intensity, various shapes. 2.Grade: N35-N52,(M,H, ... ,EH) 3.Platings: Ni,Zn,Au,CU,Chrome,.. ndfeb block magnet are highly susceptible to corrosion. We offer a variety of ... +Copper+Nickel,Gold, Organic Epoxy, Nickel+Epoxy coating. ndfeb block magnet