The HQProp 31MMX4 4-Blade propellers will take your micro drone to the next level! These aggressive blades provide great thrust and fast acceleration.
1mm shaft for brushed motors.

Propeller Diameter: 1.22 inch (31mm)
Pitch: 1 
Blades: 4
Material: Poly Carbonate
Weight: 0.27g
Hub Diameter: 5mm
Hub Thickness: 5mm
Shaft: 1mm
Adaptor Rings: NO

Includes:
2 x CW HQ Micro Whoop Prop 31MMX4
2 x CCW HQ Micro Whoop Prop 31MMX4