Ball Point Pen Cartridges offer a unique solution for artists to practice drawing and sketching techniques using a non-permanent ballpoint medium. Compatible with most cartridge grips and tattoo pen machines, these cartridges are designed for artists seeking to refine their skills without ink. Available in blue, red, and black, they mimic the feel of traditional tattooing, facilitating skill enhancement and design conceptualization. Durable and universally compatible, they are essential for both training and creative experimentation, providing a controlled output for developing hand stability and control. Each box contains 20 cartridges, making them a versatile tool for artists at all levels.