Made from solid, heavyweight fiberboard, an economical version of the aluminum model E6B including all its problem-solving features: compute time, speed, distance, altitude, true airspeed, and density altitude problems. Conversions, nautical and statute scales, wind component grid and comprehensive crosswind correction chart included. Incredibly easy to read, black print on white.  Includes case and instruction booklet. 9" x 4-1/2".