The Weems & Plath Primary Navigation Set provides all the tools you need to chart a course. Measure distances with the UltraLight Divider, draw new course lines with the 12" parallel ruler and navigator's pencil, and calculate speed and distance with the Nautical Slide Rule. The Weems & Plath Primary Navigation Set also contains a handy and durable plastic storage pouch to keep your nautical chart tools handy. Manufacturers lifetime limited warranty.Manufacturer model #: 32200. UltraLight Divider 12" Parallel Rule Nautical Slide Rule No. 2 pencil Durable plastic storage pouch