Mercury engineered a suite of five new premium propellers specifically for the Bravo Four S forward-facing drive. They’re designed to run in a dual, contra-rotating configuration, with a four-blade prop in front of a three-blade prop, which minimizes cavitation to help reduce noise, vibration and harshness (NVH). Like every Mercury prop, the new models are durable for long-lasting performance. Choose from 19 to 25.5 pitch.