C3 Replacement Blade 12-1/4 x 9 129CC3 Replacement Blade 12-1/4 X 9 | Piranha Propellers 129C Generally used on mid-range horsepower motors (approximatey 70 Hp and less). The diameter of this blade does not often work well with outboard motors made by Johnson / Evinrude though. These blades are used with C-style propeller hubs.If you are not sure if this blade is appropriate for your use, please contact us for a recommendation.