The D series from HQProp is designed for ducted drones such as whoops.

Package Includes:

2 x CW HQProp DT76MMX4-GR
2 x CCWHQProp DT76MMRX4-GR

Specifications:

Propeller Diameter: 76MM
Pitch : 3
Blades: 4
Material: Poly Carbonate
Weight :1.99g
Hub Diameter : 10.5mm
Hub Thickness:5.2mm
Shaft:1.9/1.5/1.9mm
Adaptor Rings: NO