Question: are mason jar lids stainless steel?
Answer: 😍 GREAT VALUE, HIGHEST QUALITY MATERIALS: This five pack of rust proof lids and silicone lid liners for regular mouth Mason jars are made of high quality, thick, . 3mm 18/8 304 grade stainless steel. Plastic and BPA-Free. ... They are interchangeable with our plastic storage lids and Ball plastic caps.