Surefire EWP-04 Aluminum Milspec Hard-Anodized Heavy Duty Pen w/Schmidt ink cartridge EWP-04-SL Silver Rugged aerospace-aluminum body with sleek styling and Mil-Spec hard-anodized finish Heavy-duty steel pocket clip Schmidt easyFLOW 9000 ink cartridge flows flawlessly Ink tip retracts into body; no cap to lose Available in attractive black or silver body color