Thank you for viewing. This is a protective cover that is placed over the chin rest of a violin or viola. It protects your precious instrument from dirt and sweat, and is made in response to requests from those with metal or varnish allergies, or those with sensitive skin. This particular cover can be used for both violins (4/4) and violas with Guarneri or Kaufman style chin rests. (Currently not compatible with French or other chin rest shapes.) Outer dimensions are approximately 20cm x 12cm, the pocket opening is approximately 10cm, and the depth is approximately 4cm. The fabric is a soft-to-the-touch cotton fabric (100% cotton) in brown. It is thin with no batting, so it is stress-free to attach. ⚠️Please note that due to smartphone photography, it was impossible to capture the exact color. The actual product may differ slightly in color from the photos. Place the pocket part over the chin rest and secure it with the elastic on the back. We use very soft mask elastic so as not to damage your precious instrument. We don't believe it affects the sound, but if you are concerned, you can place it over the 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 each time. The length of the elastic can be adjusted with a stopper. This stopper is also made of silicone and will not affect the instrument or sound. The button is made of acrylic, but the back of the button that touches the instrument is made of soft felt fabric. Please gently hand wash when dirty. Ironing is possible except for the elastic and button. Images 9 and 10 are instructions. (A sample was used for the photos.) ⚠️These will not be included, so please screenshot them for your reference if needed. This item is carefully crafted with the dedication of a string instrument player, but as it is a handmade item, please refrain from purchasing if you are sensitive. Thank you very much!