The HQ HeadsUp R38 Racing prop was designed with the knowledge and experience by one of the most winning piltos in the sport and the winner of the FPV OASIS race. 

Specifications:

Propeller Diameter: 5.1inch       
Pitch : 3.8               
Blades : 3
Material : Poly Carbonate        
Weight :4.4g
Hub Diameter :13mm           
Hub Thickness:7mm           
Shaft :5mm（ Compatible with POPO motor)
Adaptor Rings : NO

Includes: 

x4 HeadsUp R38 Prop