Hello Darling XO Hair Co. 10 pieces of hair 2.5 grams each. it usually takes 3 to 4 packs to do an entire head. If they have thicker hair plan for 5 packs. This is Virgin Remy best quality hair. It should last up to 8 months with proper care. We would like to introduce to you the XO Hair Extensions. It is simple and fast and the least damaging of all the methods especially for fine thin hair. A full head of extensions usually consists of 30 to 50 pieces depending on how thick your clients hair is. Each pack of the XO extensions comes with 10 pieces in it. The hair is the best quality. It is remy hair with cuticle intact. Hairstylists can join my hairstylist education group http://www.facebook.com/groups/255861755554702/?