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. If there\’s one pen that we recommend to new customers, it\’s the Bolt Action. All-metal, durable bolt action mechanism 7075 aluminum body, tip, and top Titanium internal and bolt Three lengths: Standard, Short, Mini Available in a variety of anodized colors Included refill: Pilot G2 0.7mm Mini Specifications: Length: 4.4\” Diameter:0.43\” Weight: 0.69oz Aluminum anodizes beautifully, machines quickly with minimal wear on the tooling, and is less expensive than any other material we offer. No telling if Tactile Turn will keep doing runs or how long they\’ll be in stock but, if you want to add a cost-effective pop of color to your collection, look no further.