Multi-purpose Use: These tiny mason jars are made of thick, food-grade glass, safe for daily use with jam, honey, ginger shots, sauces, spices, snacks and flavored oils. One-Piece Airtight Lids: Our 2 oz glass jars feature an integrated design, with a secure inner seal to boost airtightness and leak-proofing, keeping food fresh longer while simplifying cleaning.