... , is a spherical strong magnet which was exquisitely processed by magnetic balls.Due to the mutual attraction between the magnet poles, Neocube ... specification: Material Rare earth magnetGradeStandard N35Size 5mm, 6mm, 7mm,8mm customizedTolerance+/-0.02mmCoating:Nickel, Black, Silver, Gold, Red, Blue, Green, Pink, Purple ...