Pack includes an 18 piece set (9 containers and 9 lids) of clear, reusable and extremely durable containers made of highly durable borosilicate glass with polypropylene (PP) lids, sizes of which are mentioned in the description below Easy open-and-close four-latch polypropylene lid for a strong leak proof, airtight and watertight seal, keeping delicate foods fresh and contained; these containers are also the best choice for keeping snacks handy and fresh while on the go, and also makes for excellent party buffet bowls They are also oven safe (