This is a lightweight shoulder rest instrument part designed to secure the violin to your shoulder while playing, reducing fatigue. The size is finely adjustable for 4/4 and 3/4 violins. The height from the shoulder is also finely adjustable. The part that secures the violin to the shoulder is made of a rubber material that provides a firm, close fit. 【Color】 Black 【Size】 4/4 3/4 SIZE Approximately 21 cm *Please note that there may be slight variations due to amateur measurements. 【Materials】 ABS, Sponge, Rubber ◼️Since the description and images represent the entirety of the product, returns due to customer reasons, such as differences in color, size, or material feel, are not accepted. To prevent any issues, please feel free to ask any questions you may have.