... -15 days Detailed Product Description Product: Neocube magnet ball , Magnetic spheres , Neocube magnet , Magnetic balls Features: We also can ... advantage:1) Mateials: NdFeb magnet/sphere N35/N38/N40 grade, Use standard N35 grade neodymium magnet,the magnet force more than 5000guass2) Colors ... metal gift box5) Tolerance: +/-0.03mm of each magnet ball,and 50um coating thickness,high quality ni-cu-ni ...