ECHO CALLS INC Boss Ducks Black Single Reed Acrylic. They are tuned specifically for the competitor. When competing our calls have back pressure to allow you to blow the required number of notes for extended hail calls. It transitions well from lower to higher notes enabling the caller fewer mistakes. The success of the Echo Competition Call speaks for itself with over 200 sanctioned titles including every category of the World Championship. Specifications for ECHO CALLS INC 80002 Boss Ducks Black Single Reed Acrylic: Manufacturer: Echo Calls Color: Black Fabric/Material: Acrylic Species: Duck ECHO CALLS INC 80002 Boss Ducks Black Single Reed Acrylic