With the Meinl Sea Drum 22" FD22SD you can create soundscapes reminiscent of a beach or a surfing trip. The small metal balls are located between two different types of head (a synthetic and a natural head). So you can create two very different sounds with just one drum. The amount of metal balls inside the Sea Drum itself can be controlled through a filling opening.
Manufacturer information
Roland Meinl Musikinstrumente GmbH&Co.KG Musik-Meinl-Str. 1 91468 Gutenstetten Germany compliance@meinl.de
Remo Ocean Drum 16"x2.5" White Finish
Meinl Sea Drum FD16SD, 16" 
Remo Ocean Drum 22"x2.5" White Finish
Afroton Ocean Drum AOD 813, 50cm