Compost Tea Brew Bag : For 30-50 Gallon Barrel Sized Brews : 400 Micron Nylon Mesh : Made in the USA : 20"x22" Large Compost Tea Brew Bag, for 30-50 gallon brew Durable Nylon Mesh, 400 Microns for Maximum Microbial Extration Roll Top Design Keeps Compost In Bag Lanyard With Caribiner for Hanging Bag in Brew Vessel Made to Last in Seattle