The Mighty Marker® Blackout pen is used to mark and correct imperfections in window tinting application and other forms of transparent film. The fine tip of this transparent black pen allows detailed touch-ups for covering small line-trimming mistakes in shaded film to keep out the light. These pens contain specially formulated water-resistant inks that effectively block light-transmission and replicate the shaded films surface. • Ideal for small scratches and cut marks on film. • Ink dries in less than a minute • Comes in two distinct sizes: Fine and Broad Point • Durable metal barrel • Valve-controlled.