Healthline&reg; 100% nylon 1 Gallon 4 Bag Herbal Extracts Bubble Dry Ice Bags KIT +Free screen 4 bags with high quality,Free storage bag & screen Compatible for use with 1 Gallon buckets or tubs Bags are Labeled and Color Coded to Corresponding Micron Rating Extracts are ideal to be used for cooking, perfumes, beverages, shampoos, soaps and aromatherapy Healthline bubble bags can be used for years, Simple to Use & Clean