This is a 8x6EP Thin Composite Propeller from Advanced Precision Composites. For use on electric powered aircraft only (not for glow engines). FEATURES: Gray composite construction Comes with five adapter rings that adapt to different motor shafts. INCLUDES: One 8x6EP Thin Electric Propeller REQUIRES: ALL props require balancing, this is VERY important, use TOPQ5700. May need prop reamer, use GPMQ5005 (SAE) or GPMQ5007 (Metric) SPECS: Diameter: 8" Pitch: 6 Hub inner diameter: 0.25" (6.3mm) kpm01/25/2007 ir/jxs