The best slide-rule-style flight computer on the market, now enhanced with color for even easier readability. On the circular side, black is used for the rate arrow and units to be calculated: Red is used for weight and volume: Blue is used for distance, time and temperature scales. On the wind side, colors are used to identify wind variation: blue identifies west (or right wind correction angle) and red identifies east (or left wind correction angle). ASAs color E6-B is made with solid aluminum construction and features all the functionality pilots have relied on for decades. A venerable favorite, now even better! Vinyl case and instruction booklet included. Measures 9-3/4" x 5".