50 Gem Size Canning LidsGreat canning lids are difficult to come by, as many of you know, which is why we developed the perfect canning lids that will allow you to create airtight seals on any mason jars. INSTRUCTIONS: When using Gem Size Lids with tall vintage rings designed for glass lids, you MUST use the glass lid with the metal lid. This is because the tall bands may not tighten down the lids all the way due to the height of the band. Simply take the metal lid, set it