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 11cm and a depth of about 5cm. The outer side is a light blue-gray color with a navy blue Scandinavian floral pattern (cotton linen), and the inner side is navy blue plain sheeting fabric (100% cotton). There is no batting inside, so it is thin and stress-free to attach. ⚠️The colors in the photos may not be exactly as they appear due to smartphone photography. Please understand that the actual product may differ slightly in color 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 damage your precious instrument. We 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. You can also put it through the shoulder rest to save the trouble of attaching and detaching it every time. The length of the rubber band 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 buttons are 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 rubber band and buttons. Images 8 and 9 are instructions. (Sample used for photography) ⚠️Not included. We carefully make each item with the commitment and heart of a stringed instrument player, but since they are handmade, please refrain from purchasing if you are sensitive to details. Thank you very much!