This is a five-go masu (square wooden cup) made from Aomori hiba (Japanese cypress). It uses a single piece of knot-free wood and has a smooth, glossy texture. The wood grain pattern is beautiful. Aomori hiba contains a high amount of hinokitiol, which has excellent insect repellent, antifungal, and deodorizing effects, as well as being quick-drying. A masu made from Aomori hiba is a gem. It's perfect for drinking sake. How about it?