... Balls 1) Different size: 3mm,4mm,4.8mm,5mm,6mm...10mm 2)COlor: NI,BLACK-NI,GOLD,SILVER, AND colorful 3 ... . Black M Cube: 216 magnets. Mega M Cube: 1000 magnets!. Neodymium magnets with a colorfull coating ,gold, silver,black nickel, blue ... quality standard N35 or N38 Neodymium magnet balls.Diameter: 4mm,4.8mm,5mm,6mm,7mm,8mm,9mm,10mm(tolerance+/-0.02mm)Color: gold ...