Note: Our CW standard, if "Clockwise Rotation"(from pilot's view), it's CW. The material of each prop is not the same, the appearance may be different, does not affect the use, the picture is for reference only. Material: Beech wood Size: Multiple sizes for choosing Type:CW(Clockwise Rotation"(from pilot's view)) Used for: RC gasoline airplane Advantage: High quality beech wood, beautiful wood grain; strong resistance to stamping. CNC high-precision lathe proceing and longer service life. Good quality and smooth paint treatment to prevent injury when you turn prop. Has good dynamic balance and high speed stability. Very light, turn faster, give you a different flying experience. Close grained European Beech wood, it can be quick spooling up and throttling down. Low drag coefficient to maximize efficiency. Superior thrust to weight coefficient. Specification: There are more than 230 countries and regions in the world, and the standard definitions for propellers are different, so we can make some explanations according to the definitions of CW and CCW in our factory Our "CW" is pulling the RC airplane, usually installed in the front, "CCW" is pushing the RC aircraft, usually installed in the back. If it from pilot's view, Clockwise Rotation, it is CW If it from pilot's view, Counterclockwise rotation, it is CCW. Of course, the easiest way is to distinguish them by pictures. Usually the number of people using CW is the largest Flight RC Hobbyrecommended propeller selection chart: DLE2014x10, 15x8, 16x6 DLE3018x10, 19x6, 19x8 DLE35RA19x8, 19x10, 20x6 DLE4019x10, 20x8, 20x10 DLE5522x8, 22x10, 23x8 DLE6022x10, 23x10, 23x12 DLE6523x12, 24x8, 24x10 DLE8525x10, 25x12, 26x10 DLE11126x12, 27x10 DLE12027x10, 27x12 DLE13027x12, 28x10, 28x12, 29x10 DLE17032x10, 32x12 DLE22232x12, 34x12 Package includes: 1xGasoline Wood Propeller( the size as you chose)