Fresh Keeper 20-Piece Citrus Storage Set Easy lid/container match by color (each size is in it's own color) Airtight, "burpable" seal to preserve freshness during storage Date-set feature to track food storage time (simply align lid pointer with date on container rim) Heavy gauge plastic for durability Microwave safe, freezer safe, dishwasher (top rack) safe, BPA-free and made only in USA