This is a 7x3 Airplane Propeller that is a "tractor" (not 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 / "C2" design / / INCLUDES: One Carbon-Reinforced NYLON Propeller / / SPECS: Length: 7" Pitch: 3 / 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 FOXQ1520 (Metric)