These are fiberglass-filled plastic propellers. Adding fiberglass makes them more rigid/stronger than a propeller made only of plastic. These are a low-cost alternative to metal boat propellers. These don't need to be balanced or sharpened.
Specifications:
Pitch ratio: 1.4
Blades: 2
Material: Glass-filled reinforced plastic
Mounting: 3/16" (4.75mm) Drive dog
We recommend these for the 10K-25K RPM Range.
Rotation: Counterclockwise when viewed from behind the boat. See picture 1 to view the prop's rotation.