This is a foldable shoulder rest. It has been used for several months. It can be used for 1/4, 1/8, 1/10, and 1/16 size fractional violins. The legs fold, making it easy to store in a case. It is currently sold on Amazon for 5,000 yen. Excerpt from Amazon: KUN has created the world standard for shoulder rests with its beautiful design and innovative structure. KUN has been highly regarded worldwide for 35 years in the manufacture of shoulder rests. With a shape designed based on ergonomics, combining ease of use and comfort, and a design that minimizes the transmission of vibrations to enhance sound quality, KUN shoulder rests have established a global market. KUN's first shoulder rest design is still very popular. KUN has created various innovative designs, such as folding mechanisms and lateral adjustment mechanisms. All of these are KUN patents, and research and development are still ongoing to meet the needs of players in every aspect. Due to its high quality, comfort, and durability, it is loved by musicians worldwide. In addition, through donations to numerous musical organizations, it contributes to the development of not only the music world but also society as a whole. Shoulder rests are a hidden but important item that affects the tone and playing comfort of the instrument. Shoulder rests are not necessarily required. However, because they greatly affect the playing comfort of the instrument, you need to carefully consider not only whether to use them or not, but also the design that suits your body type and the compatibility of the material with the instrument. The tone also changes depending on the material. There are mainly wooden and plastic materials, and walnut, maple, and ash are often used for wood. Hard wood produces a clear and resonant sound, while soft wood produces a gentle sound. Plastic is light, making it easy to use for beginners. KUN Collapsible with a convenient folding function The Collapsible can fold its legs, making it very convenient for moving and storing. The left and right legs can be adjusted in three stages to suit the player's body type and preference.