Product - Disposable Grip specifically for the Cheyenne Pen Brand - Cheyenne Sterilized - Yes Grip size available - Ergo Round, Ergo Once Inch, Ergo Long. Sold in - 6pcs/Box Product Info - These disposable tubes are screw on instead of your aluminum grip that originally came with the machine. This will make your machine less prone to cross contamination. Compatable - These disposable tubes will fit all Cheyenne Pens. For those using the Sol Nova, it will only work with the Ergo Round and Ergo One Inch.