Centri Signetic Features: The Centri Signetic is the first pen that is power by a coil and not a electric motor. Offer the give of a Coil machine but in Pen Cartridge Machine. -Solid state cartridge machine- -Single 3/8 core 24 AWG hand wrapped coil- -Has a Cartridge Alighment & Stroke Adjuster- -Frame is made from Aircraft aluminum- -Unlike other pens, this machine offers the "Give" of a coil- -Industry cartridge compatible- FREE RCA Cord include, this RCA Cord has to be True RCA Cord.