Racers asked for slightly stiffer and faster version of the popular HQ 5.1×4.1×3
This is the answer from HQ!
This prop was designed having in mind only one thing, RACING!

Check out our full line of 5″ props and HQprops

Propeller Diameter: 5.1inch
Pitch : 4.2
Blades : 3
Material : Poly Carbonate
Weight :4.9g
Hub Diameter :13mm
Hub Thickness:7mm
Shaft :5mm Compatible with POPO motor)
Adaptor Rings : NO