Q1:Is this 100% Human Hair? A:Yes. 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: When you measure the hair bundle, please stretch the wavy to straight and then measure from the top to the end of the longest part. Please choose the size group that suit you most. Q3:Hair Smell? A:100% chemical free,it may have local shampoo smell,but can be removed by cowashing with shampoo and conditioner. Q4:How long does it last? A:It depends on your maintainance(generally 5-10 months). Washing regularly with conditioner and oil are key to keep its charming. Q5:Can I dye/color it? A: Yes, The hair can be Permed/Dyed/Bleached/Highlighted. (#613 and #27 will not recommended) Please wash it with conditioner or oil reguarly to keep its charming after dyeing.