This product's small cloth bag is made of 100% unbleached pure cotton material. It is safe and odorless. After boiling, it will not produce any odor. The small black spots on the bag are remnants of cotton seeds. They can be washed off and used again. The cloth bag features a fine mesh and drawstring sealing design, providing excellent filtration effect. It can fully release the aroma of ingredients. The opening and closing is convenient and it is not prone to leakage. The product has a wide range of uses. It can be used for filtering tea, coffee, spices, and soups. It can also be used to store candies, soaps, jewelry, and for making sachets or gift packaging. The cloth bag is made with solid and durable materials. After washing and drying, it can be reused. The set contains 20 pieces, making it suitable for daily household use as a soup bag, tea filter bag, storage bag, herb bag, or aroma bag.