Material: Real Human Hair Kindly note: real human hair will not be too straight, you can straighten it before you use it Function: add hair volume, cover grey white hair, cover thinning hair If you have any question on how to use, please feel free to write to us And, we encourage buyer to communicate with us if there is some problem with the item Question & Answer: Q: How to tell human hair with synthetic hair A:It is easy to tell by burning and smell : When burning , the human hair will show white smoke. While synthetic hair will be a sticky ball after burning and will show black smoke. Moreover, human hair may have very few gray hair and split end. It is normal and not a quality problem.