A sturdy Numarkasten! Please be sure to read the contents. ■ Features of this work ・Sturdy resin case ・The back of the box is engraved with the golden ratio. ・The size of the box itself is also the golden ratio. ・Transparent acrylic inner lid ・Opening and closing lid to hide only half ■ Contents ・Numarkas body [Silver] ・10 marbles [Blue glass marbles] +200 yen for an additional 10 marbles. If purchased separately, it will be 400 yen. ■ Target age 3 years old and up ■ Size (approx.) Width 15, Length 10, Height 3cm Numarkas Early childhood education Educational toy Nature Science Please refrain from purchasing if you are concerned about the details, as this is a amateur sale. Discounts are available for multiple purchases and repeat customers, so please comment. Popular keywords... Shichida method Type... Numbers