The Tactile Turn Aluminum Bolt Action pen uses Tactile Turn's all-metal bolt mechanism. One smooth motion advances or retracts the refill.
The body is 7075 aluminum, which Tactile Turn picked because it is much harder and more durable than the common 6061, anodized here in OD Green. The internal parts and bolt are titanium, and the clip is stainless steel for deep carry. The Mini size is 4.4" long and takes a Pilot G2 Mini 0.7 mm refill.