Model 1, hair patch has a life up to 8 to 12 months depending on the maintenance. The piece gives you the most natural look as like the hair is growing out of your own scalp. This piece has a very good quality of hair and skin base system to provide you natural look. The hair knotting is 2.1, so one hair knot would have 2 to 3 hairs. The hair quality is Remy finest quality, with freestyle. You can use hair patch to cover the bald area can be attached using clips, tapes, and glue. It has a breathable base. This hair system is single knotting system. You can apply shampoo, color, oil, gel, serum etc.