Microtech Knives | Siphon IILever action pen by Microtech. This unique pen uses a Fisher Space pen refill.Specs:Overall Length: 5" (127mm)Closed Length: 3.59" (91mm)Handle Material: Outbreak - Deep EngravedPocket Clip: Tip-DownWeight: 4.06oz (115g)Manufacturer Ref. #: 401-SS-OBDSCountry of Origin: USA