This two sided slot/trough call has a copper side and an aluminum side. Bearded Tom calls it a slot call, but most would call it a trough call. I have three copper/aluminum two sided calls and like them all but am downsizing my collection. Trying to narrow it down to 12 calls total. Still have a ways to go so will let this one go for $20 and I pay the postage. Geez, the striker is worth $15! This will be a good, fun and very reasonable priced call to try out this season. I hope you like it as much as I have. Can't go wrong at that price! Sale pending arrival of check as of 3/4.