The product is best in terms of what raw materials it uses. Organic cotton sanitary pads and panty liners are made from organic cotton from Texas, USA, and always isolate only the best raw materials. Occasionally, you may see a small brown or black colored part on the cover of the product. This is an unavoidable phenomenon in which a small amount of functional cotton leaves or stems are added during the organic manufacturing process. Please use it with confidence as we have cleaned it up perfectly during the manufacturing process.