The 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, now in a slimmer, lighter body. Bronze is a copper-tin alloy with a warm golden tone that develops a deep patina over time. The Slim adds a milled, deeper-carry clip and the same 'Tactile' texture, so its character only grows with every day of carry.