The Yamaha ring key patch completely covers the holes of the key caps to ensure even better sounds without changing the tone. If the keys are soiled, wipe them on the side that comes into contact with the patch beforehand. Attach the patch in a position so that the holes on the upper surface of the key caps are completely hidden (ensure that all wrinkles are smoothed out.) Package includes ten patches – five patches per sheet, two sheets per package. Ring Key Patches fit any brand or model flute.