18 pitch four blade Yamaha prop. Yamaha’s misleading “V6” in the description is why I am selling this cheap. Please notice the picture with the tape measure, this is a small hub and leaves a gap. I’m guessing this is a bass boat or light load prop. Whatever it’s for, it didn’t work on a heavy boat with a 150hp. It has about a half hour on it, My loss is your gain. Notice the small dent on exhaust ring that I am pointing out with a pen. Otherwise it’s flawless.