1)Neocube,nanodots,buckyballs,magnet balls 2)Nickel,silver,gold,black,red,blue,green etc 3)4mm,5mm, ... ,6mm,7mm,8mm(tolerance+/-0.05mm) Coating Nickel-Copper-Nickel (NiCuNi) coating with silver,gold, black nickel and shinning nickelMagnetic power(N35grade):5mm 5000 ...