SUMI shoulder rest is fully adjustable, collapsible, and durable. Solid molded feet with sure-grip technology securely grip the instrument. The molded feet will not wear out or damage / scratch the instrument. Fully adjustable for height, length, and position on the instrument. Built-in swivel to better contour to your body. Foam padding is plush yet durable and provides a firm grip. Collapsible feet to better fit in the case. This rest is adjustable to fit 15 inch to 16.5 inch violas. For violas smaller than this try the SR10.