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OK, Ivo's at least partly right here... :) The only one I can find that sold recently did go for about $12, but it was labeled "Dble Duck." I know I've been outbid several times after bidding in the...

The Dubl Duck combo regularly goes for more than $50 on eBay. Good snag! :)

I think you're right about the sides; I'd guess they are medium and fine. Haven't used one myself, but they are well...