Our 3d Reel diaphragm calls is absolutely amazing for hitting those deep estrus cow notes and guttural bull vocalizations. The variable pitch and volume capabilities of these elk mouth calls really make them stand out in a crowded field full of lookalike and sound alike mouth calls. Scream at the top of your lungs or dial it back to coax that pressured bull the last few yards. Anything an elk can say you can too. Locator bugles, Bull calling cows, chuckling, growling all in the most accurate tones. Non latex reed. FDA food contact approved plastics. No tape No Glue No ink No metal taste. We think its much more consistent and easier to blow than any other diaphragm every made.