Nickel colored neo-cube magnetic ball(5mm diameter bucky balls). 216pcs 5mm diameter ball to be one set.can provide you hours of enjoyment in endless types.Creative and hot puzzle toy for enhancing assembly ability. Magnet Cube makes the game more interesting in your hands and help children to stay away from electronic products to protect the eyes. Also be suitable for office use, used for creativity and craft decoration on your desktop.Under 14-year-old children need use it under adult supervision.