MC bite down models are unique in that the mouthpiece is two parts... the orange outer voice enclosure & the reed itself. This part of our reed manufacturing process ("Another MC First") enables our technicians to tune or adjust the curvature of the body of the reed to a set number. This allows for a consistent & accurate (tuned) sound in each of our bite down products. This call can also be used to make rabbit distress by simply blowing thru the mouthpiece (no bite). This type of calling or mixing coyote vocalization with rabbit distress is a great combination with proven success.