1) Every set Includes 216 magnetic balls 2) For children above 8 years old 3) Can train 1.Grade and size: we can produce any grade and size according to your requirement, but our mainly products are 5mm and 8mm of N35.2.Coating: nickel, black nickel, silver, gold,3. 216pcs/set, Dia5mm4.As for the packing description, we have two kinds of package. One is the white iron box for every set, and the ...