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 to order for those with allergies to metal or varnish, or those with sensitive skin. This cover can be used for both violins (4/4 size) and violas if they have a Guarneri or Kaufman 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 4.5cm. The outer side is Liberty's vintage print "Franche" Tana Lawn (100% cotton) in a pale pink color, and the inner side is a plain burgundy sheeting fabric (100% cotton). There is no batting inside, so it's very thin and stress-free to wear. ⚠️Photos taken with a smartphone, so the colors may not be perfectly accurate. Please understand 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. It shouldn't affect the sound, but if you're 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 adjusted with the stopper. This stopper is also made of silicone, so it won't affect the instrument or the sound. The button is an aluminum button covered with the same Liberty fabric, 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 11 and 12 are the instructions. (A sample was used for the photos.) ⚠️These will not be included, so please save them by taking a screenshot if needed. As a stringed instrument player, I make each one carefully with dedication and care, but since these are handmade, please refrain from purchasing if you are overly concerned about details. Thank you, and I look forward to your order!