Some racers asked for slightly stiffer and faster version of the popular HQ 5.1x4.1x3
This is the answer from HQ!
This prop was designed having in mind only one thing, RACING!
Propeller Diameter: 5.1inch
Pitch : 4.2
Blades : 3
Material : Poly Carbonate
Hub Diameter :13mm
Shaft :5mm（ Compatible with POPO motor)