Three-blade, X7 AlloyTM stainless steel design * Thinner blades and higher rake angles create unprecedented efficiency in all ranges of operation * Increase both acceleration and top speed; the large blade area produces a better hole shot, and the high-performance blade geometry creates better top speed. * Designed for 18-to-22-foot boats powered by outboards with 175 hp or higher. The prop fits Mercury engines, as well as competitive V6 outboard engine models.