For Thin Hair: 100gram is enough to make a full head, 50gramto make a highlight color For Thick Hair:150gram-200gram to make a full head. Tips: The weight of the hair is the same from 14inch to 24inch,the longer the hair is, the thinner it is, you need to choose more hair if you have long hair. In addition, the specifications of different types of hair weft are also different. For example, virgin machine weft and flat silk weft are 50 grams/bundle, genius weft is 25 grams/bundle, hand-tied weft is 10 or 15 grams/bundle, and remy machine weft is 100 grams/bundle.