def do some research [SEP] well i would have to say i didnt know the diff in the grams of hair and what that meant however after hours of research i do now these are great as far as feel construction and look however very very thin and not at all the coverage i was expecting on my hair which is inches long all the way around i would def need a second pack to make them look anywhere close to real hair soooo i added them to an existing hair piece for now till i can order in another set on a brighter note they are def worth the if you are not looking to fill a whole head quality of the hair is good and there was minimal shedding