Thank you for viewing! This is a protective cover to be used on the chin rest of violins and violas. 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 Kauffman type chin rest. (Currently not compatible with Fresh 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 surface is a quilted knit fabric like a T-shirt, with a polka dot print, and the inside is navy twill fabric (100% cotton). It's stress-free to attach. Because of the thin batting that is quilted, it will be slightly thicker, but it won't absorb sound or change the height of your chin rest. ⚠️Photos were 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. Simply cover the chin rest with the pocket part and secure it with the elastic on the back. We use very soft mask elastic so it won't damage your precious instrument. We don't think it will affect the sound, but if you are concerned, you can put it on top of 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 also be 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 10 and 11 are the instruction manual. (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 care and attention to detail, but as these are handmade, please refrain from purchasing if you are overly concerned about minor imperfections. Thank you for your consideration!