This is a 5x3 1/2A Free Flight Composite Propeller from Advanced Precision Composites FEATURES: Comes in a bag attached to a header card Gray composite one-piece construction INCLUDES: One APC 5x3 1/2A Free Flight composite propeller. REQUIRES: ALL props require balancing. THIS IS VERY IMPORTANT. Use TOPQ5700. May need prop reamer, use GPMQ5005 (SAE) or GPMQ5007 (Metric) SPECS: Diameter: 5" Pitch: 3 Hub inner diameter: 0.25" cdh8/26/03 ir/jxs