This is a double-sided frontal adhesive tape that is great for extended wear. Can be used on poly liner on hair systems as well as on lace based units. The paper backing of the tape is marked to let you know which side to use for a lace or poly---just flip it over for the attachment you require. Gives you a natural hair line and a secure hold. Eliminates the use of red liner over top of blue liner tapes. This tape is only 9.5 mils thick so it will give you a natural look on the front of your hair piece. Strong hold so it's great for extended wear!