The Kun Fork combines the latest elastomer technology with internal ridges to provide exceptional grip on your instrument. For the following Kun shoulder straps: For Super Violin / 3-1-1 / 2 (434,532); Standard for Violin 3 / 4-1 / 2 (434,504); Collapsible 3 / 4-1 / 2 for Violin (434,542).