The Everest ECS Spring Collection of Shoulder Rests are not only collapsible, but also are able to adjust from a 4/4 size violin to most 1/2 size instruments while still offering the same level of comfort and durability while playing. Each piece is made from a single piece of high grade ABS material that provides strength and flexibility and features Everest's quality baked paint which creates a smooth finish and adds color to your playing.