Tactile Turn Bolt Action Pen - CopperThe unique bolt action shape allows for one fluid motion to advance or retract the refill because the surfaces of both the interior part and the inside surface have been carefully machined to be extra smooth, the action feels amazingly satisfying. If there's one pen that we recommend to new customers, it's the Bolt Action. The Standard 5. 6" comes with a Pilot G2 0. 7 mm refill and the Short 5. 1" comes with a Schmidt EasyFlow 9000 medium refill.