PicoPen Ti - Titanium Mini-ballpoint Pen with Magnetic Keychain Holder by TEC Accessories Machined from a solid piece of 6AL-4V Titanium bar stock Magnetic cap retention keeps the pen on your keychain and quickly accessible when you need it Accepts standard Zebra-F refill (ships with ink cartridge already installed in the pen) Overall Length (including cap): 107mm [4.21"] long. Pen body is 7.0mm [0.276"] in diameter and 93mm [3.66"] long