The Quaker Boy Mama Moose Call is designed to reproduce the mating bawls of a cow moose or the lost calls of a calf moose. This call features an open reed and an expandable tube, allowing for a variety of sounds to attract moose effectively. The o-ring can be adjusted to your preferred position for optimal use. By adjusting the lip and teeth position on the open reed, you can create many variations in your calling, making it a versatile tool for hunters.