Boing SH-40 Octagonal Sweat Lodge Drum - 16" diameter leather skin. The special way of pulling these thick hides, creates an extreme tension which gives a rather high, strong and far reaching tone. These are different from the tones created in normal frame drums. These drums can also be played in wet weather. Because these are natural hide drums they do vary in their tones but in a dry room they always return to their original state.