HM Tools & Dye Spring Type Rotary Tattoo Machines - HM’s venture into rotary machines started with the goal of building one that had the look and feel of a coil machine. By emulating the balance, dimensions, and performance of a coil, these powerful rotaries were created to be reliable, steady, and easy for tattoo artists to get accustomed to using. The Evolution is a shader that will push any magnum, making it ideal for solid coloring and black and grey work.