The ChartPak 3/16" Matte Black Chart Tape is made with high-quality tape that helps create even, solid lines. Each roll measures at 3/16" wide by 54' long. The tape is used by Camera Assistants as a thin surface to write focus marks on, when applied to the circumference of a lens barrel. It can also be used to make camera registration charts. Filmtools carry a selection of colors and sizes of chart tapes.