Kun Collapsible When it was introduced in 1994, the KUN Collapsible violin shoulder rest became the shoulder rest of the future. The compact Collapsible shoulder rest features a modern design similar to that of the KUN Original, with one important addition: end members that fold down for easy carrying and storage. And a new size adjusting mechanism introduced on the Collapsible Mini in 1997 makes it the only contoured violin shoulder rest that fits four sizes of violin. Available for viola, full-size violin (4/4), violin (1/2 and 3/4) and mini (1/4 - all 1/16s).