PP Plastic Material: Made from sturdy PP plastic, these lids are built to withstand repeated use without cracking or warping, making them an eco-friendly for your canning projects. Quality Sealing: Each lid features a built-in sealing ring groove and a threaded design that ensures a secure, airtight seal, perfect for preserving your homemade jams, sauces, and other canned goods. Perfect Fit for Standard Mouth Jars: Designed specifically for standard mouth jars, these 70mm (2.76-inch) lids fit perfectly on most mason jar, providing a reliable storage solution for all your canning needs. Convenient Bulk Pack: This set includes 10 lids, giving you plenty of replacements for your canning jars so you can stay prepared for all your culinary creations, whether they're for storage or gifting. Versatile Uses: Ideal for canning, these lids are also perfect for DIY projects, organizing small items, or creating personalized, making them a versatile addition to your kitchen essentials.