This is a 9x3.8 thin composite propeller from Advanced Precision Composites. These are for use on electric powered aircraft only (not for glow engines). Slo-Flyer propellers work well with electric powered Park Flyer-type aircraft.

• FEATURES:
  Computer-optimized design gives these props a thinner profile and more "bite" with less noise.
  Lightweight molded nylon construction reduces rotating mass for higher output and longer life.
  Reinforcing carbon fibers help maintain true, constant pitch at any rpm.

• INCLUDES:
  One carbon-reinforced nylon propeller
  One set of small shaft locating rings
  One locating ring instruction sheet

• REQUIRES:
  Assembly onto motor or gear drive unit in your electric plane.
  Balancing