The Kun Collapsible, for 1/2 and 3/4 violin. When it was introduced in 1994, the Kun Collapsible shoulder rest quickly became the shoulder rest of the future. When it was introduced in 1994, the Kun Collapsible shoulder rest quickly became the shoulder rest of the future. Modelled on the Kun Original, the innovative Kun Collapsible has "feet" that fold down for easy carrying and storage, and incorporate Kun's patented locking device.