VIVOSUN 1-Gallon 8-Bag Herbal Ice Bubble Hash Bag Essense Extractor Kit Filtration Bags/Set Made of long lasting nylon material, super sturdy, prevents from flaking and chipping after several uses. Varied microns of bags allow filtering herbal resins into different grades to meet your need. Package comes with free 25 micron pressing mesh screen and storage bag. Corresponding color micron bags are labeled for proper order. The smaller micron screen is, the less crystals escape, the better filter performance you will get. (1)Purple=25Micron(2)White=45Micron(3)Yellow=73Micron(4)Black=90Micron(5)Orange=120Micron(6)Red=160Micron(7)Green=190Micron(8)Blue=220Micron