I haven't used it much, but it's used, so if you don't mind the condition, how about it? Regarding the amount of hair, it's difficult to say, but if you tie it in a single knot, the diameter would be about 2 cm. Considering the top part is see-through and the stopper, it seems like it would be used to add volume to your own hair. ★ The hair color is black. ★ I checked the current website and it seems there are mixes of human hair and synthetic hair, polyester synthetic hair, and acrylic synthetic hair. I don't know which type this wig is.