Magnet Ball Size: D5mm,216pcs/set Coating: Ni coating Grade: N35 NdFeB Magnet Tolerance:+/-0.02mm Product Name: Magnet BallUsing the NdFeB Magnet Spheres (Neocube) to create ... : N35, N38, N40,N42,N45,N50,N52... ... Coatings: Ni, Zn, Cu, Black Ni, Gold, Silver and etc. Sizes: D3mm,D4mm,D5mm,D6mm ...