QTHAIR hair extensions are premium quality human hair, which were cut off from one young lady directly, have no chemical treatment,no synthetic, or animal hair. They can be easily Straightened, Curled, Dyed, Bleached and Styled by your favor. Q1:100% Human Hair?A:Testing by BURNING- Human hair will show white smoke while burning and then turn to ash;Synthetic hair will show black smoke and will be a sticky ball after burning.Q2:Hair Length?A: Stretch it to STRAIGHT and then measure.(0.1-0.3 inch margin for error is accepted).Q3:Hair Color?A:Natural Black. All Items are Real Shooting. For display, light, environmental reasons may be a Slight Deviation phenomenon, please in kind prevail.Q4:Hair Smell?A:Our hair is 100% chemical free,but it may have local shampoo smell on it, anyway it will lift your shampoo and conditioner smell shortly after co-wash.Q5:How Many Bundles Do I Need?A:For a full head,8-16 inch hair need 3 bundles, 18-22 inch hair need 3-4 bundles, and above 22 inch need at least 4 bundles.Q6:How long it last?A:It depends on your maintainance.Treat it like your own hair with hair care tips, normally it can last 6months to 1 year.Q7:Can I dye it?A:Yes. In general, it?s easier to darken the hair than to lighten it, we recommend to dye darker, since it?s difficult for the original color fade. And dying needs strictly requirement on time and dyestuff, if you are not professional, please go to Salon.Q8. Return/Refund Policy?A:For any Quality Problems, We can accept refund or replacement.