Meinl Percussion FD20SD 20-Inch Sea Drum with Goat Skin Head, African Brown The Meinl Sea drums create the soothing sounds of ocean surf with a special filling that can be rolled about inside the drum This 20" Diameter drum is equipped with a synthetic head on the bottom and a natural goat skin head on top for varied sounds Slowly tip the drum from side to side to roll the steel ball filling against either drum head to mimic the sound of ocean waves 2.75" Deep rubber wood shell in dark brown finish Great for sound meditation, relaxation, and therapy practices, as well as creating sound effects for any style of music