This cube is a set of seasoning containers which is consisted with 4 containers. The greatest feature is the humidity adjusting. Paulownia wood protects the seasoning inside from humidity by breathing. Another point is the protection of outside humidity. The lid gets tighter when the paulownia absorbs humidity and swell. Also, the manufacture has been making paulownia wood boxes for decades and has precise manufacturing techniques to make containers with no gaps. This prevents humidity from getting inside.