Choose the model Anode for propeller Max/Prop 42 mm Anode for prop. Max/Prop 25/28 mm Anode for prop. Max/Prop 28/35 mm Anode for prop. Max/Prop 35/45 mm Magnesium anode for prop. Max/Prop 25/28 mm Magnesium anode for prop. Max/Prop 28/35 mm Magnesium anode for prop. Max/Prop 35/45 mm