KUN Violin Shoulder Rest Original 4/4 Shoulder rest for violin 4/4 size I used it by attaching it to a 3/4 violin. Weight: Approximately 57g Total length: Approximately 19cm It is not foldable. It has a simple design and is durable. A standard shoulder rest that is popular among professionals and amateurs. It has a simple design but is durable. The width, angle, and height of the legs are adjustable, allowing it to fit the violin securely.