A 5-piece onigiri (rice ball) storage container that can be frozen. - Brand: EBISU - Product Name: Onigiri Storage Container - Quantity: 5 pieces - Features: Freezer-safe, microwave-safe, dishwasher-safe Thank you for looking. This is an unused item from a bulk purchase made several years ago for sending frozen meals. It comes with 5 pieces. The current product is sold in sets of 4. You can freeze them as they are and then defrost them in the microwave. Ideal for sending frozen meals or for freezing leftover rice. Solves the problem of uneven onigiri sizes when making them! This is a home-stored item. Please refrain from purchasing if you are concerned about this. To minimize shipping costs, the items will be disassembled and shipped via Takkyubin Compact.