The Matrix is one of the fastest and most versatile goose calls on the market. It is quickly becoming many hunter's and guide's "Go To" call because of its precise low end control and its ability to replicate multiple goose subspecies. The Matrix comes with the Field Proven Mark I gut system in combination with a medium bore diameter for extra comfort in the hand. The short length offers lightening fast sound combinations and its ability to sound like multiple geese is unmatched in its field. All Matrix goose calls are hand tuned and carry the Field Proven Promise Life Time Warranty.