Foxy locks extensions 120g vs 160g?

ok, i ordered my foxy locks extensions on friday. I bought the 120g of hair. I have medium to thick hair. Not to thin and not to thick of hair. But do u think that i've should have gotten the 160g? Or is 120g good enough? If you use these extensions or used them in the past, plz tell me the difference and your experience. Thanks a bunch!