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Because stainless is strong, durable, and rust-resistant. Plastic is too, but more easily breakable, unless you use one them awesome micarta's or g11's, but those aren't stock.
I don't know, when I...

Though, just on pure bad-ass-ness, the stainless steel is perfect for taking the razor to the gym, for many reasons. PLus it has the 'medical' vibe about it which creeps some, thrills others.
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I'm also interested in the answers we get from the woodwork on this one...