Thank you for viewing! This is a protective cover to be used over the chin rest of a violin or viola. It protects your precious instrument from dirt and sweat, and is made at the request of those with allergies to metal or varnish, or those with sensitive skin. This cover can be used for both violins (4/4) and violas if they have a Guarneri or Kaufman type chin rest. (Currently not compatible with Fresca type or other shaped chin rests) Outer dimensions are approximately 20cm x 12cm, with a pocket opening of about 10.5cm and a depth of about 4.5cm. The outer side is a blue-purple color with a black kitten pattern (100% cotton), and the inner side is black plain broadcloth (100% cotton). There is no batting inside, so it is thin and stress-free to attach. ⚠️The colors could not be captured as they are due to smartphone photography. Please note that the color of the actual product may differ slightly from the photos. Cover the chin rest with the pocket part and secure it with the rubber band on the back. We use very soft mask elastic so it won't scratch your precious instrument. I don't think it will affect the sound, but if you are concerned, you can put it over the shoulder rest or wrap it around the shoulder rest. Also, if you put it through the shoulder rest, you can save the trouble of attaching and detaching it every time. The length of the rubber band can also be finely adjusted with the stopper. This stopper is also made of silicone, so it will not affect the instrument or the sound. The button is made of acrylic, but the back button that touches the instrument is made of soft felt fabric. If it gets dirty, please wash it gently by hand. Ironing is possible except for the rubber band and buttons. Images 10 and 11 are the instruction manual. (A sample was used for the photo) ⚠️It will not be included, so please download it if necessary. As a stringed instrument player, I make each one carefully with care and attention, but since they are handmade, please refrain from purchasing if you are sensitive. Thank you very much!