Higdon Outdoors Riven Stratum Diaphragm Elk Mouth Call 1524AB31 HG. This bad boy sits on a large frame non-dome chassis making it slightly more challenging to run vs. a domed style call. With a little practice the sounds this call produces will literally blow you away Features of Higdon Outdoors Riven Stratum Diaphragm Elk Mouth Call: Remarkable Bull & Cow sounds Large frame non-dome chassis Slightly more challenging to run vs. a domed style call Sounds this call produces will literally blow you away Package Contents: Higdon Outdoors Riven Stratum Diaphragm Elk Mouth Call The Stratum mouth call produces remarkable Bull & Cow sounds. This bad boy sits on a large frame non-dome chassis making it slightly more challenging to run vs. a domed style call. With a little practice the sounds this call produces will literally blow you away HG65230