Some balsa (or wood of your choice) and BBQ skewers.
Good for 3S if you don't push them too much.
I flashed these with SimonK firmware.
5030 Propellers (Red) - 3xCW and 3xCCW - 6pcs per bag
5030 Propellers (Black) - 3xCW and 3xCCW - 6pcs per bag
For more build information check out my mini tricopter, it is very similar.