I'm building a few copper calls as i speak , got the soundboards gluing , i'm using glass for the boards in this batch , i did get a few blasted copper and a few plain , the blasted surface dont take long to be needing to be touched back up , i also just recomend the plain copper , i'm using 100 grit on mine to scratch them up , it grabs the striker good and sounds good with alot of controll