1)NEOCUBE by 216pcs 5mm N35 Neodymium magnet balls 2)Nickel,gold,black,silver 4)4.8mm,5mm,6mm,7mm,8mm,9mm 5)SGS&CE ... :Made by 216pcs high quality standard N35 or N38 Neodymium magnet balls.Diameter: 4mm,4.8mm,5mm,6mm,7mm,8mm,9mm(tolerance+/-0 ... ), 50um thickness three layers base coating(Ni-cu-Ni)Magnetic force(N35grade):5mm 5000-5400guass,6mm 5400-5800guass,7mm 5800-6200guassCertification approved ...