Our new Katana two-blade weedless prop combines NASA’s hydrofoil design and Mercury Outboard Propeller’s industry-leading technology for the most powerful and efficient trolling motor prop on the market. Katana props deliver more power and up to 30% more battery efficiency compared to previous props and excel in current, shallow and open-water applications. 10.25" diameter, constructed of engineered polymer. Prop kit includes prop pin, nut and washer. Made in USA.