Educational tool for learning arithmetic and number concepts through "seeing" and "touching." Features: * Durable resin case. * A divider in the center allows for intuitive understanding of number groupings and the composition of 10. * The golden ratio is engraved on the back of the box, and the size of the box itself is also based on the golden ratio. You can intuitively and intimately feel the mathematical beauty. * There are indentations for the beads to fit perfectly. * Comes with a sliding lid to prevent loss of beads. * By sliding the lid halfway, you can hide how many beads are on one side. * The design has been modified so that you can roll the beads while the lid is closed. * The lid clicks shut. Contents: * Nummer Kasten body * 10 white marbles * Add 10 more marbles for an additional 200 yen. Condition: * Unused * The surface is matte and smooth to the touch. Recommended for both learning and interior decoration. Size (approximate): Width: approx. 15cm, Length: approx. 10cm, Height: approx. 3cm Recommended points: * Popular as Montessori education and STEAM materials. * "Number art" experience that both children and adults can enjoy. * Simple and golden ratio design, good for display. Type...Numbers Popular keywords...Montessori Nummer Kasten Numakas Educational toys Type...Nature/Science Popular keywords...Shichida Method Please refrain from purchasing if you are concerned about minor details, as this is a private sale. Discounts are available for multiple purchases and repeat customers, so please comment.