Graupner S Series carbon fiber-reinforced props. These have a 1.6" pitch ratio. Higher than the K Series m4 props. These are light, sharp, and don't need to be balanced or sharpened! Looking at the back of the boat, these props spin counterclockwise. These are screw-on style to fit 4mm threaded shafts.
Specifications:
Pitch ratio: 1.6
Blades: 2
Material: Carbon-fiber-reinforced plastic
Mounting: M4 threaded shaft
Rotation: Counterclockwise when viewed from behind the boat. See picture 1 to view the prop's rotation.