The Kun Junior fits 3/4 and 1/2 sizes and is one of our most popular shoulder rests. Height adjustable similar to same model for 4/4 violin with four width adjustments on both ends. The Kun Junior and Kun Junior Collapsible #1313C differ from the Kun Super Jr. #1313JS in that they have four holes on each end for width adjustment. See Kun Super Jr. for description. Some prefer this design due to it's greater width adjustment capability.