Virtual Sun BM4020G 20-Gallon 4-Bag Herbal Ice Extracts Bubble Kit Triple stitched with 100% nylon bonded thread for extra strength Virtual sun bubble bags can be used for years, over 100 times Made of top quality monofilament. Drawstring storage bag - blue - 220 microns - red - 160 microns - yellow - 73 microns - purple - 25 microns Free pressing screen