Bobelock Arrow Adjustable Viola Case | A big case for less weight. Built using a layered plywood case construction, it has been newly redesigned to maximize the arrow styled case shape. The durable nylon canvas zippered cover features an outside music pocket. This arrow shaped adjustable case offers a patented adjustable slide to fit shoulder block that fits any size viola from 15" through 16.5" but weight in at only 6 lbs.!