This is a Numakasu (a type of container) for 20mm size marbles. ■ Features of this product: ・Durable resin case ・By sliding the lid halfway, you can hide how many marbles are on one side. ・You can roll the marbles with the lid closed. ・Compatible with 20mm marbles ■ Contents: ・Numakasu body [Silver or Silver and Blue Bi-color] Please comment your desired color. ・Marbles [None] ■ Size (approx.) Width 22cm, Length 12cm, Height 3cm ■ Target age 3 years and older Numakasu Early childhood education Educational toy Nature Science Made and sold by an amateur, please forgive the quality of the details.