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 on both violins (4/4 size) 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 10cm and a depth of about 4cm. The fabric is a soft-to-the-touch cotton fabric (100% cotton) in brown. It is thin without any padding, so it is stress-free to attach. ⚠️ The colors in the photos may not be exactly as they appear due to smartphone photography. Please understand that the color of the actual product may differ slightly from the photos. Simply 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 damage your precious instrument. It shouldn't affect the sound, but if you are concerned, you can put it over your shoulder rest or wrap it around the shoulder rest. You can also thread 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. If it gets dirty, please wash it gently by hand. You can iron it, except for the elastic and buttons. Images 9 and 10 are the instructions. (A sample was used for the photos.) ⚠️ These will not be included, so please save them by screenshotting if necessary. As a stringed instrument player, I make each one carefully with dedication and care, but since these are handmade products, please refrain from purchasing if you are overly concerned about details. Thank you for your consideration!