Materials Side: Yakusugi cedar Bottom board: Cedar Size Outer dimensions: 37cm x 24cm x 5.7cm Inner dimensions: 30.7cm x 21cm x 4.5cm Because Yakusugi cedar is used, the wood grain is very beautiful. Natural wood has a unique wood grain depending on the environment in which the tree grew, the type of tree, and the direction of the cut. Although it may be difficult to see in the photos, the finished Yakusugi product has a "Ukuzuri" (wood grain raising) finish. The divider plate is removable.