APC 12x3.8 SFP counter rotating propeller pair. APC Landing Products Slow Flyer RC electric composite model airplane pusher propeller A12038SFP is designed for use with electric rc airplanes and coaxial electric rc helicopters. APC Slow Flyer props are not for high power applications but are specifically crafted for low power use. Includes locating rings in various sizes and instructions on adaptation procedures. APC Landing Products electric model airplane propellers have enjoyed strong acceptance and growth since their introduction in 1989. They are especially popular in rc pattern flying and rc airplane racing events. The performance and low noise advantages are largely spawned by the precision methods APC - Landing Products uses to design and manufacture APC electric rc airplane propellers. Note: This rc aircraft propeller is designed only for use with electric motors. Do not attempt to use this propeller with glo or gas powered engines. --- Specifications --- * Length: 12 inches * Pitch: 3.8 inches per revolution * Type: Slow Flyer Electric, Counter Rotating Pair * Material: 1 Piece Composite * Use: Electric RC Airplanes & Coaxial RC Helicopters * Blade A: Clockwise Rotation * Blade B: Counter-Clockwise Rotation * You will receive a total of 2 propellers: one left hand rotation and the other right hand rotation (in other words: one pusher and one puller)