This is a 10x6 Airplane Propeller that is a "pusher" Prop . / / 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: Two Carbon-Reinforced NYLON Pusher Propeller / / SPECS: Length: 10" / Pitch: 6" / Thickness at hub: 1/2" / Hole diameter: 1/4" / / REQUIRES: ALL PROPS REQUIRE BALANCING. THIS IS VERY IMPORTANT! use TOPQ5700. / May need prop reamer, use GPMQ5005 (SAE) or GPMQ5007 (Metric)