Liner or Shader - Both Multi-Purpose Machine Type - Rotary Machine Brand - Hummingbird Rotary Motor - Swiss Motor Frame Material - Aluminum Weight - 3 oz The Hummingbird rotary machine is made of aluminum which means better heat dissipation and lower operating temperature. This rotary uses a high velocity swiss made motor. Adjustable Stroke: It is capable of hitting at any stroke length from 2.6 mm up to 5.5 mm for lining or shading. Needle Bar Stabilizer: Currently Plastic, but you can UPGRADE to the Brass Stabilizer for just $15 more. This machine also has a stabilizer that keeps your loop bar down. So say good bye to your rubber bands because this machine will not need it. Runs smoothly between 6-8 volts and has an RCA connection.