Solas Rubex 135-300hp 4-Blade Aluminum Propeller utilizes 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 painting process ensure corrosion-resistant performance. 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 High-tech painting process