MING Disposable Drawstring Paper Empty Tea Filter Bags Tea Infuser Bags (Pack of 100PCS) Made from green natural materials,eco-friendly and safe for human health. Healthy and Without bleaching,Non-toxic,Non-fluorescent agents,No Heavy metals. Suitable for tea, spice and herbal powder. These bags are used for filling with 3-8g mixture of tea or dry herbs. Ways of seal off: seal it off by string.No using hot iron or electric iron.