Made from 100% food grade premium nylon material, no toxic chemicals or bleaching material, very safe and healthy Easy and convenient to be put in or taken off from the tea cup with drawstring It is heat-resistant and rub resistant, having properties of high performance, fine workmanship, practical and durable Great for holding tea leaves, all herbs, spices or bouquet garni in making home tea, stews, marinades, soups and casseroles etc. Its opening is easy to sealed, nylon sealing machine(not included) is needed to seal it; the tea leaves, herbs or spices will be blocked in the bag thus won't scatter anywhere in your cup or soup pot