These RhynoStick White Line Strips are PSA sanding strips made with high quality Aluminum Oxide and modified synthetic resins. This means these strips will have high performance with high cutting power. These strips also have an excellent long working life. These long board strips use a self-adhesive tap system. They are perfect for use in automotive finishing and paint stripping. The strips have a release tap for easy use. Grits 36 - 120 have a D weight paper backing. All grits come with 50 strips per box.