Primos has studied the recent interest in hand blown gobble calls. They are effective if you can master them. They worked hard on the Double Gobble to produce a hand blown call that is easy to use. Realizing that some hunters would not master the hand blown call, we pushed on to make sure everyone would be able to use this call. They added the ability to attach a bellow tube to the mouthpiece which makes producing a Jake or Mature Gobble effortless! The Double Gobble is perfect for challenging gobblers to come in or locating them.