This is an onigiri case that allows you to make large, generously filled "bomb" onigiri (rice balls) that are easy to carry. I received this as a gift, but I've never used it, so I'm putting it up for sale. Although it's unused, please understand that it has been stored at home. Size: Approximately 10.9cm wide x 10.6cm deep x 5.6cm high Capacity: Approximately 290ml Not dishwasher or microwave safe.