Recommended for 1/8 - 1/4 size violins, but will work on any violin or viola! The "Petite Original" Violin Shoulder Rests are made of resilient contoured ergonomically designed foam with great memory to fit into any size case. The extra foam will snuggle over the collar bone while the flat side that goes across the shoulder is perfect for young students with shorter neck space. Choose the location and angle of placement for your preferred comfort. Our patented design curve assists proper placement for your Shoulder Rest.