Tough Top plastic Mason jar lids for regular mouth Mason jars are designed to withstand wear by providing the best in durability. Tough Tops include a silicone gasket to ensure a completely airtight and leakproof seal, perfect for storing food, drinks, salad dressings and small items, with faceted sides for easy opening and closing. Organize your pantry, fridge, bathroom and workspace effectively with Tough Tops. Each pack contains 4 regular mouth Tough Tops made of BPA-free and phthalates-free plastic and silicone.