Fits 1/2 to full size violins and 12-15 violas. The “PSR Original” violin viola shoulder rest has a steep slope over the collar bone that assists in holding the instrument up without drooping it over the chest. Since the base over the shoulder is flat: this model is the most universal, great for professionals and children with a relatively short neck, allowing the advanced performer with liberty to pivot their instrument over their shoulder for expression with various musical styles. One “PSR Elastic Band” and one “PSR Magic Strip” are currently included. Try the “STRAIGHT” or “ANGLED” placements for your preferred comfort, made of resilient contoured ergonomically designed foam with great memory to bounce back to its original shape. Our PATENT NUMBER 7,262,352 design curve assists proper placement for your shoulder rest.