... to measure the lengthFAQ :Q:How many pieces Hair for one head?12-14" 2 pcs16-22" 3 pcs24 ... Hair Extensions can tangle due to dryness, oil & dirt build-up, salt water, chlorine and not combing (wide tooth comb) ... or consult your stylist for more help.Q:How long does it last?This hair can last for a very long ... take good care of the hair, it can last for over one yearQ:Can they be straightened, curled ?Yes ...