Solas Amita 3-Blade Yamaha/Honda 9.9-20hp Aluminum 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. Superior coatings and a high-tech 4-layer painting process ensure anti-corrosion performance. Traditional pressed-in rubber hub absorbs vibration and reduces slipping. 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 4-layer painting process Corrosion-resistant Pressed-in rubber hub