Yield Lab Bubble Extraction Bag (1 Gallon 4 Bag Set) The Yield Lab 1 Gallon 4 bag Filtration Kit is designed to safely and efficiently extract herbal resins and that plants naturally secrete for essential oils, fragrances, soaps, and more Various sizes of micron screens from 220 micron to 25 micron can be used for different extraction needs Made of durable waterproof coated nylon material, with built-in flexible cord for binding the filled bag Color coordinated bags include 25 micron (Purple), 73 micron (Yellow), 160 micron (Red), 220 micron (Blue) Use is simple: Place bags into bucket, starting with the 25 micron and ending with the 220 micron bag. Fill cold water into bucket to cover halfway full of the bags, and fill with your trimmings and ice, stir for 30 minutes, drain, and scoop your extract