... )NEOCUBE by 216pcs 5mm N35 Neodymium magnet balls 2)Nickel,gold,black,silver 4)4.8mm,5mm,6mm,7mm,8mm,9mm ... ,7mm,8mm,9mm(tolerance+/-0.02mm)Color:Nickel,black,silver,gold(24K), 50um thickness three layers base coating(Ni-cu-Ni ... )Magnetic force(N35grade):5mm 5000-5400guass,6mm 5400-5800guass,7mm 5800-6200guassCertification approved: SGS(ROHS ...