Ojyu, it is usually used for a small or big party, such as New Year party, as a lunch box for picnic with family and friends. Under the cherry blossom, families, lovers, co-workers and friends are enjoying a party and bring many kinds of food in the Ojyu. Various type of Ojyu are prepared from single box type to three layer boxes. On the other hand, Lunch Box (Japanese Bento) is used every day. You can create your idea how to use it and how to fill food for your important person. Please invite your important person to have a good meal with the traditional box.?You can wash it with a tender sponge and synthetic detergent. You can wash it with a tender sponge and synthetic detergent. Please avoid the use of the dishwasher. Please avoid the use of the microwave oven.