Everest shoulder rests are designed in the USA and manufactured with the finest material and workmanship. Our shoulder rests were designed by a Johns Hopkins' biomedical engineer to overcome the many shortcomings of existing traditional shoulder rests. Everest Violin and Viola Shoulder Rests are the only ergonomically designed and patented collapsible shoulder rests that provide the best comfort for violin and viola players of all levels. Fits 3/4 and 4/4 size violins.