Charms with zodiac signs for stethoscope Charms, embossed over a matte black gloss finish. *CharMED are unadjustable and fit most stethoscopes. For a snug fit, foam inserts are included. Charm Cleaning and Care For those of you working in high risk areas of the hospital, cleaning your stethoscope once weekly can help prevent the spread of bacteria between patients. The good news is that charMED bling can be cleaned the same way! Simply wipe down your stethoscope and charMED bling with a swipe of