Hmm I rang back and I think I misunderstood its one of these not alu - any experience? http://comprop.com
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Yep, that's a composite (Plastic) prop. I have a couple Piranha props, also composite, and a Gil Six Gun prop as well.
I like the Piranha because they help protect the outdrive by their ability to flex and absorb any hits, while breaking more easily if I hit something serious. Blades are $19 each to replace and slide into the hub. I have a 4 blade & 3 blade hub, and run a 23p 3 blade, or a 21p 4 blade.
My Gil Six Gun has 6 smaller blades and I run a 21p on it as well. I think that prop was $79 and also has individually replaceable blades, though they're out of business now, so blades are hard to find. My Metric likes this prop a lot more than my CVZ did.
Comprops are essentially molded props that, like it says, are temporary spares to get you home. I've used the Piranha as my primary prop for years now and have been really happy. I think I lose about 1-2 mph on the top end over a SS but am on par with a Aluminum prop.
I like them b/c I don't have a lot money in props...and if they break...$19...no big deal.