Made of sturdy and high quality plastic, can be used for a long time. Can be used to seal all types of food bags and storages, such as potato chips, snack bags, breads, coffee bags and frozen food bags, etc. Bag is not easy to loose after clamped by this clip. Bag clips are easy to open and close, can be wash in dishwasher. Simple, durable, reusable and convenient. It's a necessary foods preservation tool. The barrette-style design makes them safely closed, keeping foods airtight and watertight from being stale.