Solas Saturn 3-Blade Mercury 9.9-25hp Stainless Steel Propellers utilize a state-of-the-art squeeze-casting process that makes these aluminum propellers stronger and tougher than traditional die-cast propellers. Squeeze-casting produces propellers with finer grain and much less porosity than die casting and equals thinner yet stronger blades. This provides outstanding acceleration, cruising and top-end speed. Right rotation. State-of-the-art squeeze-casting process Stronger and tougher than traditional die-cast propellers Finer grain Less porosity Thinner yet stronger blades Outstanding acceleration, cruising, and top speed