These solid bamboo lids are perfect for all your dry storage needs! They can be used both in the fridge, freezer or for dry storage. They have a food safe silicone seal to help keep air out. Made to fit regular mouth canning jars which includes many popular brand jams, nut butters, pasta sauce jars etc... *do not place in microwave or dishwasher Why buy a new glass jar when we have so many at our disposal? *jars not included