Solo Grip, disposable cartridge needle tubes make setup quickly and easy. Solo Grip Tubes are compatible with most if not all coil tattoo machines as well as rotary machines. Solo Grips are machined from quality materials and are designed with a no slip grip. Rest assured Solo Grips are individually packaged and sterilized by E.O. Gas. They come in Black, 1” diameter grip, 20 tubes and bars per box. The revised locking mechanism make the interchanging of cartridges simple.