A few weeks ago I nailed a large rock with my prop and broke the drive shaft in my lower unit. After getting a replacement rebuilt lower I decided to switch from a Stainless Steel prop to Aluminum (my home lake has MANY rocky areas)
My original prop was a Quicksilver 14.25x21 and I could only get 4,800 rpms and 47 mph(gps) with my 135 Black Max (30 year old motor) I researched a lot of possible replacements and decided to check out Turning Point Hustler.
They use a squeeze cast to form their props, a process similar to how we forge aluminum parachute hardware at work so I know the parts are tough.
I went with a 14.25x19 and my RPM's are now 5,300 and I can just break 50.3 mph (gps) I am VERY satisfied with the new proformance, so I would highly recomend to anyone with an older boat looking for an inexpensive upgrade to try out one of these props.