The Pro Mallard single-reed design makes this call an easy-to-blow call. It features a tuning hole in the bell or stopper, which allows you to change the pitch of the call and sound like two different ducks. This call can be used with very little air pressure. You wont wear yourself out blowing this call.Easy blowing single-reed callBlows when wet!Sounds great in timber or over open waterMade with .010? Mylar reed for raspy quacks to clear high callsTuning hole in the bell lets you change tone and pitch