FAQ Q1: How to Tell Human Hair With Synthetic Hair? A: Human hair has natural protein, it's easy to tell by burning and smell. When burning the human hair will show white smoke, while synthetic hair will become a sticky ball after burning and will show black smoke. Moreover, human hair may have very few gray hairs, it's normal and not a quality problem. Q2: How to Measure the Length? A: Stretching the Hair to be Straight and then Measure. Q3: Can the hair be dyed? A: All of our hair products can be colored or lightened. We highly recommend a color preview test on a swatch of hair to see how your new color will look. Q4: How long does it last? A: It depends on how you maintain it. Treat it like your own hair and take very good care of it, and then normally it could last longer than 1 year.