UIM class F1 and F2 racing propeller. Fits Mercury engine.
About size(pitch and diameter) and cupping:
Pitch determines the max speed that this propeller can achieve.
Diameter varies blade area, therefore affects grip. Bigger diameter = more grip.
Cupping varies from 1-6, where 1 is very "slippery" and 6 has very good grip.
Blade area affects grip and bigger blades are more difficult to start up in water.
Photo of 3d model. Real product pictures are coming in future.