It's a LOT cheaper than going to a marina with a Michigan Wheel type pressed in spun rubber hub and paying them a lot of money to press out the old "spun" hub and press in a new one. I love the system. I can change props just by changing the prop. Also, you'll find that various makers used various materials. I've got props with plastic, rubber and even one that seems to be using some kind of nylon. But they all fit on my engine as quick as 1,2,3.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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