Now Available in 7075 Aluminum or 303 Stainless Steel. Aluminum is light weight. A full matte black version of the the Bolt Action Pen v.02 - S. Smooth action, design upgrades such as chamfered edges around the bolt track, and a newly fitted thread with o-ring, the Bolt Action Pen v.02 in Onyx sports an INVENTERY signature emblem in black Overall, v.02 offers nuanced design additions but, most noticeably, greater precision. If you own the first version, you’ll feel the immediate difference with this one. Compatible refill sizes: Small: Pilot G2 Mini - Made in U.S.A. Small: 11.3cm / 4.45” Diameter: 10.4mm Aluminum: 23g Stainless: 52g Precision Machined -