Echo Calls 90022 Ace in The Hole Single Reed Attracts Ducks/ Mallard Sounds Matte Black AcrylicThe Ace In The Hole is loud and raspy. 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! Made in Arkansas.