1,The shoulder rest can perfectly fit the violin and your shoulders. It is common for 4 or 4 and 3 or 4 size violins. 2,The violin shoulder rest is made of thick and widened sponge material, which is soft and stress‑free. 3,The back is made of a single piece of ABS material, which has strong load‑bearing capacity and is not easily deformed after long‑term use. 4,The fixed part is made of soft silicone material, which will not slip when installed on the violin and will not damage the instrument. 5,The height of the shoulder pads can be fine‑tuned according to how far you screw the arm support in. Item Type: Adjustable Violin Shoulder Rest Material: ABS and silicone and sponge 1 x Violin Shoulder Rest 1 x Cleaning Cloth Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.