Meinl ClamShell Shaker by Meinl Percussion. $29.99. The Clamshell Spark Shakers have a single solid weld holding the two halves of the shell together like a hinge. When you squeeze the two halves together you get a wildly variable pitch response because one half is high pitch and the other half is low pitch. This allows for high-low pitch combination patterns to be played.. Save 38%!