Comes with one re-usable Patty Adult Hairline Protector. Instructional Video Link Included upon purchase. Fits regular to large adult scalps. They are breathable units that allow hair dressers to safely protect and fill in fine to damaged hairlines. For full hair installations using braid and sew or braidless track applications with crown parting. Lined with a fine silk lace inside and outside of the perimeter for ventilating baby hairs as well as functionality and durability. Use closures, frontals or a 360’s while creating natural looking parts at crown area.