Gold Neocube 5mm Diameter: 5mm/ball Packing: 216 balls per set, with iron box Gold Neocube 5mm/Neocube/Magnetic Balls Super Strong Neocube,Magnetic BuckyBalls. Stimulate the creative juices in your brain.Build, create, destroy, and build again. Hours of fun and entertainment. These are more than just a toy, use them for science experiments, making jewelry or fun creations for the refrigerator, ...