ECHO CALLS INC Ace In The Hole Ducks Black Matte Single Reed Acrylic. These calls produce a barking quack that can be heard at extremely long distances. The farther the distance the more realistic this call sounds. Echo's acrylic calls are louder and have more range than the PolyCarbonate Keyholes we offer and are tuned to sound exactly the same only much louder Specifications for ECHO CALLS INC 90022 Ace In The Hole Ducks Black Matte Single Reed Acrylic: Manufacturer: Echo Calls Color: Black Fabric/Material: Acrylic Species: Duck ECHO CALLS INC 90022 Ace In The Hole Ducks Black Matte Single Reed Acrylic