With nail hair in 100% Remy human hair extensions, you get longer and voluminous hair by attaching strands of hair with keratin on its top of your hair near the scalp. This is done using a heat tong that melts the keratin wax and fused to the strands of your own hair. Since the keratin wax is the same color as the hair, it is not visible after application. With nail hair you get a permanent wear of your hair extension. A set of nail hair comes with 50 strands of hair.