QRP Plastic Lid Airlock GROMMETS 1/16" Groove White Food Grade Silicone for fermenting in Mason Jars ~ Bulk Quantities Available (13) SUPER FAST SHIPPER ~ EVEN FOR ORDERS RECEIVED BY 5 PM CST ON SATURDAY! (unless handling time is set for more than 1 business day) 13 QRP GROMMETS are made of USDA Food Grade BPA-free Compliant White Silicone and produced by a reputable food container manufacturer. QUALITY RELIABLE PRODUCTS GROMMETS are for fermenting with airlocks (3/8" center hole diameter), easily insert into 9/16" lid holes, and fit any brand Mason jar plastic caps (1/16" groove). GROOVE IS NOT WIDE ENOUGH FOR FIDO GLASS LIDS. And YES, straws will fit! :O)