Whoop props from HQProp are here!
HQProp Micro Whoop Prop
Spec: 31mm 1.2X1.3X4 .8mm Shaft
Includes a set of 2 CW & 2 CCW in your color of choice.
will give you a bit more flight time over gemfan, but are way under powered to gemfan, great for reducing any jello.
I found these to drain the battery faster than the gemfan 4 blades but were pretty grippy