magnetic balls cubes puzzle with golden color

Features: Color: Nickel Diameter of ball: 5 mm each ball Made of 216 pcs strong magnetic NdFeB balls (NdFeB is a permanent-magnet technology) coating:ni-cu-ni Packaging: opp for free ;packing with tin box should add $0.3. In priciple, packing will comply with customer's requirement. Can be used an educational tool for children; Also a good gift for friend Warning: only for 12++++ years old more information: we also can supply N38,N42,N45 and N48grade we also can supply gold, silver,black nickel, blue, red colors we also can supply tin box,bottle,pVC box, and so on. we also can supply diameter in 4mm,4.8mm.6mm,7mm,8mm