The Kun Original fits 4/4 and 3/4 sizes and is one of our most popular shoulder rests. Height adjustable from 1 1/2 to 2 by lengthening/shortening screws, and legs pivot for pitch adjustment. The Kun Original #1313 and Kun Collapsible #1313C differ from the Kun Super #1313S in that they have four holes on each end for width adjustment. Some prefer this design due to its great width adjustability. See Kun Super #1313S for description.