ACME 3038 4 Blade 14" x 10.5" Propeller Black Friday The timer is essentially invisible The timer is essentially invisible in its operation which means you can use your ballast system exactly like you would otherwise and the Timer Module will automatically turn the pump off to reduce the likelihood of damage Compared to the almost flat plane of glass on the mirror that was included on nearly all watersports boats 5" Propeller is a true performer thanks to ACME's continued devotion to push the ski and wakeboard boat propeller industry to new heights inboard props are helping ski and wakeboard boats achieve performances never before seen The ACME 3038 4 Blade Propeller will perform up to and surpass the standards you expect from the moment you pull it out of the box and put it on your boat