Solas Amita propellers provide outstanding acceleration and top speed. Using a state of the art squeeze-casting process, plus theoretical calculations, geometry design, and modern CAD technologies, Solas prop construction is stronger and tougher than traditional die-cast products. This aluminum propeller has 4 layers of paint to ensure excellent anti-corrosion performance. Propellers are exposed to over 500 hours of testing in a saltwater spray tank, and this testing simulates more than 6 months of normal saltwater use. Traditional rubber hub is designed to resist vibration. Large blade design offers better thrust and is suitable for heavy boats. 4 layers of paint to ensure corrosion resistance Rubber hub resists vibration | Amita 3-Blade Propeller, Pressed Rubber Hub / Aluminum, 13.2 dia x 21, RH