D'Luca Adjustable Viola Shoulder Rest, Black. It's light weight and adjustable. Very conveninet for orchestra practice, or for performing. The D'Luca Adjustable Viola Shoulder rest is made out of high-quality ABS plastic. Features a comfortable and 10mm sturdy foam that is durable and soft to the touch. The shoulder rest is light and handy, and easy to use. Can be adjusted to fit violas raging from 15. 5 inches to 16. 5 inches. Just attatch it to your viola and your'e set to practice or perform. Includes 1 Viola Shoulder Rest