This is a 17x8 Pattern Composite Propeller from Advanced Precision Composites. FEATURES: Gray composite one-piece construction Comes in a bag attached to a header card INCLUDES: One APC 17x8 pattern 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: 17" Pitch: 8 Hub inner diameter: 0.25" (6.3mm) Weight: 0.0471 lbs (21.3g) jxs 7/27/04 ir/jxs