Thank you for viewing! This is a protective cover to be used on 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 violin (4/4) and viola if the chin rest is a Guarneri or Kaufman type. (Currently not compatible with Fresch or other chin rest shapes) Outer dimensions are approximately 20cm x 10cm, the pocket opening is about 10cm, and the depth is about 4cm. The outer side is a brown fabric with a black kitten pattern (100% cotton), and the inner side is a plain black broadcloth (100% cotton). There is no batting inside, so it is thin and stress-free to attach. ⚠️Photos taken with a smartphone, so the colors may not be perfectly accurate. Please note that the actual product may differ slightly in color from the photos. Cover the pocket part over the chin rest and secure it with the rubber band on the back. We use very soft mask elastic so it won't damage your precious instrument. It shouldn't affect the sound, but if you are concerned, you can put it over the shoulder rest or wrap it around the shoulder rest. Also, you can put it through the shoulder rest to save the trouble of attaching and detaching it every time. The length of the elastic can 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. Please wash gently by hand when dirty. Ironing is possible except for the elastic and buttons. Images 9 and 10 are the instructions. (A sample was used for the photo.) ⚠️These will not be included, so please download them if necessary. As a stringed instrument player, I make each one carefully with dedication and care, but since they are handmade, please refrain from purchasing if you are overly concerned about details. Thank you for your consideration!