This sturdy, high-quality E6B Flight Computer is built for a lifetime of duty out of aluminum and high-strength plastic. The rotating computer side of the device is used to solve all the flight planning calculations needed for flight navigation. The back of the unit calculates the effect of wind on the aircraft. Comes with user manual (including practice problems and answers) and a protective vinyl storage pouch. Computer measures approx. 9-5/8 in x 5 in. x 1/4 in. Includes a built-in ring for hanging storage.