6 Ballpoint Pen Cartridges for Tattoo Practice

Each package comes with six ballpoint dot pen cartridges. There are three black and three blue cartridges contained in each package. The ballpoint pens are .5mm and are perfect for tattoo practice! Each cartridge will last for four hours of continual use. We are currently working on a version for coil machines, different ballpoint sizes and other products to aid you in the tattoo learning process. These will not harm your tattoo machine unless you apply a large amount of pressure. Specs * Six ballpoint dot pen cartridges * Three black & three blue * .5mm ballpoint size * Ink lasts for four hours of continual use per cartridge *Patent Pending* *Tattoo machine not included*