Vietnamese hair is 100% real human hair (no henna, no synthetic/artificial hair), 100% virgin hair (one woman's hair), 100% natural hair (have full cuticle, original from women, not re-treated with chemical, not re-dyed, not re-bleached) and 100% remy hair (never tangled, all hair pieces inside a remy hair bundle have the same direction from root to tip), natural dark color (#1,#1B or #2). Only washed with shampoo to clean dirty. Quality of hair: thin, strong, soft and silky.