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 Fresh type or other shaped chin rests) Outer dimensions are approximately 20cm x 12cm, the pocket opening is about 10cm, and the depth is about 4cm. The outer side is made of soft-touch sheeting fabric (100% cotton), the inner side is twill fabric (100% cotton), and there is no batting inside, so it is thin and stress-free to attach. Although it is the same brown cotton fabric, the colors are slightly different. ⚠️Because I took the photos with a smartphone, I couldn't capture the colors exactly as they are. Please note that the color of the actual product may differ slightly 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 rubber so it won't scratch your precious instrument. I don't think it will 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. Also, if you put it through the shoulder rest, you can save the trouble of attaching and detaching it every time. You can also fine-tune the length of the rubber band 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 rubber and buttons. Images 9 and 10 are the instruction manual. (A sample was used for the photo) ⚠️It will not be included, so please save it by screenshot if necessary. As a stringed instrument player, I make each one carefully with dedication and care, but since they are handmade, please refrain from purchasing if you are sensitive. Thank you for your consideration!