Premium Tinplate Material: Thicker Material Not Easy Bending & Rust , which can be reused many times, can withstand high and low temperatures, can be used in refrigerators, microwave ovens and dishwashers. Excellent Sealing Performance: The silicone sealing ring back of the mason jar lid is food-grade , The sealing ring inside the jar lid makes the mason canning jar lids have good sealing performance 50 PCS Wide Mouth Canning Lids Set: The bulk canning lids include 50 pack 86mm wide mouth mason jar lid, great-value and enough quantity can meet our multiple cans needs in different canning seasons. SIZE: each diameter size is 3.3 inches / 8.6cm, compatible with most ordinary wide-mouth mason jars, can be used in refrigerators, microwave ovens and dishwashers. 【Multi-Function Usage】Suitable for sealing the mason canning jars that stored spices, sweets, biscuits, fruits, jams, soft drinks, tea or coffee, nails, screws, and other