Food-Grade Material: Made from food-grade tinplate and BPA-free silicone sealing ring for safe use Perfect Fit: Designed for regular mouth jars with a diameter of 2.68 inches (68 mm), fitting 70 mm bands Large Quantity: Includes 140 canning lids, suitable for extensive canning needs (lids only, no bands) Durable Design: Rust-proof, corrosion-resistant, and leak-proof, ensuring long-lasting use Thickened Lids: Constructed with thickened material to prevent bulging or deformation during use Airtight Seal: Features an outer edge silicone sealing ring for perfect sealing performance and leak prevention Easy Labeling: Allows for easy labeling with a permanent marker to note date, time, and contents One-Time Use: Designed for single-use only, ensuring optimal sealing and preservation