Liner or Shader - Multipurpose Machine Type - Rotary Machine Brand - Jack Hammer Frame Material - Iron Weight - 5.2 oz Motor RPM/s - 9000 Product Info - Jack Hammer® Tattoo Rotary Machine Rotary Swashdrive Technology has come a long way and now being used widely in the Tattoo Industry. This New Jack Hammer® Jr. Rotary Tattoo Machine can run up to: 9000 rpm. Based off the original Jack Hammer® design, this new machine has been simplified and now mass produced. Offering our customer a quality machine at an affordable price.