Spawn jars lids are perfect for your jars of sterilized grains. These are the same great lids we use on our jars! Each lid has a self healing injection port and a 5 micron filter patch. The jars lids can be reused 2-3 times. Each lid comes with a band to secure the lid to the jar. These lids come in 2 sizes. Large mouth (90mm) or regular mouth (70mm). Please choose your lid size from the drop down menu.