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 4 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.