Keyboards are valuable investments. If you want to protect the tools of your trade, M-Audio's got you covered. Made from 100% stretchable nylon with adjustable locking drawstring, these rugged covers come in four sizes to fit most keyboards. Includes limited lifetime warranty.X-Small: 25-49 note keyboards. Small: 49-61 note keyboards. Medium: 61-76 note keyboards. Large: 76-88 note keyboards.