This is a KUN shoulder rest, a standard for violins. It can be used for fractional violins: 1/4, 1/8, 1/10, and 1/16. ■ KUN Collapsible mini 1/16-1/4 Shoulder Rest ■ 1/16-1/4 size ■ Collapsible ■ Width adjustment mechanism ■ Resin construction ■ Made in Canada Please also check the photos for the condition. It's a super beautiful item, used only a few times. "Designed based on ergonomics, with a shape that combines ease of use and comfort, and a design that minimizes the transmission of vibrations to enhance sound quality..." This is a used item, so we would appreciate it if you could understand that. If you have any questions, please feel free to comment. I have a young child, so I will respond as quickly as possible, when I get a chance. There are no smokers or pets. I am an amateur, so there may be oversights, but please understand that this is a no-return, no-refund sale. 999-3021999