This is a pair of 2-Blade Propellers for the AquaCraft Mini Rio Offshore RTR EP Boat (AQUB15**) FEATURES: FRP (fiber reinforced plastic) construction, Black in color INCLUDES: Two 2-Blade Propellers for the AquaCraft Mini Rio boat REQUIRES: Installing on propeller shafts SPECS: Hole Diameter: 1/8. Propeller Diameter: 30mm Pitch: 41mm