New-12 Pack, FermentEm(tm) Wide Mouth Mason Jar Silicone Seals-Made in the USA 12 FermentEm Wide Mouth Mason Jar Gaskets (lids not included) USA Made from BPA-Free Translucent FDA-Approved Food Grade Silicone. 961 Trading is the ONLY authorized seller of FermentEm products, any other sellers are not selling genuine FermentEm products. Silicone Seals are Washable and Re-usable Perfect for Wide Mouth Mason Jar Plastic Caps, Create an Airtight Seal ID: 2-3/4" OD: 3-3/8" Thickness: 1.6mm