- Fits Regular Mouth Lids: Includes 10 reusable platinum silicone seals designed specifically for regular mouth mason jars with a 2 3/8" internal diameter. Each sealing ring has an outside diameter of 70mm (2.75"), an inside diameter of 50mm (2"), and a thickness of 2.6mm (0.1"). - Superior Quality: These seals are leak-proof, airtight, and built to last. They feature a better design compared to competitors, specifically designed to fit ball plastic storage caps, stainless steel lids, and more. The thicker silicone rings include a groove for a secure fit, with the groove oriented upward toward the lid's top. - Safe and Eco-Friendly: Made from BPA-free, platinum cured silicone rubber, these seals are free from harmful plastics. They are dishwasher, freezer, and microwave safe, ensuring safe food contact without chemical leaching. Platinum cured silicone offers higher purity compared to standard peroxide cured options. - Versatile Applications: Ideal for fridge and freezer storage, pantry organization, and transporting food or beverages without leaks. Perfect for homemade fermenting lids as well. For optimal performance, use with threaded closure jars; may not create an airtight seal with wire bail or clamp jars. Not suitable for canning. - Enhanced Performance: The thicker design and secure fit prevent leaks and ensure freshness, making these silicone seals a reliable choice for all your food storage needs.