Easy and convenient to be put in or taken off from the tea cup with drawstring. Made from premium nylon material, It doesn/'t included any chemicals or bleaching material, very safe and healthy to use. It is heat- and rub , having properties of high performance, fine workmanship, practical and . Its opening is easy to sealed. You need to use nylon sealing machine(not included) to , the tea leaves, herbs or spices be blocked in the bag thus /'t scatter anywhere in your cup or soup pot. Great for holding tea leaves, all herbs, spices or in making home tea, stews, marinades, soups and casseroles etc.