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) 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 4.5cm. The front side is made of soft-touch sheeting fabric (100% cotton), and the inside is twill fabric (100% cotton). There is no batting, so it is thin and stress-free to attach. Both the front and back are made of the same brown cotton fabric, but the color tones are slightly different. ⚠️ 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 scratch your precious instrument. It shouldn't affect the sound, but if you are concerned, you can put it on top of 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 elastic can 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. Ironing is possible except for the elastic and buttons. Images 9 and 10 are instructions. (A sample was used for the photos.) ⚠️ These will not be included, so please save them by screenshotting, etc., if necessary. As a stringed instrument player, I make each one carefully with care and attention, but since these are handmade items, please refrain from purchasing if you are overly concerned about details. Thank you for your interest!