QTY:3MM-512PCS Features: -Can be assembled into various shapes to satisfy your imagination while stimulating and exercising your left and right brain hemispheres. -An anxiety relief toy, can keep you relaxed and your hands busy and away from your phone -It can be shaped as necklaces, bracelets, or any type of jewelry. A great holiday or birthday gift for teenagers or adults. Specification: Shape: round Diameter: 3mm Material: magnet Colour: 8 Package Included: 512x Magnetic balls 1x Tin box QTY:5MM--216PCS Features: .