These high-impact pens are made of precision-machined 6061 aluminum and hard anodized to withstand scratches. The cap-less design allows the pen to always be ready as a kubaton defense tool. The flutes and grooves on the pen provide a secure grip even under combat situations while the high-pressure clip ensures this pen will remain where you clip it under any circumstances. To write with the pen, just twist the bottom clockwise and the ball point pen emerges. Ink color is blue. Uses parker style ball point pen refills (not included). 5 3/8" overall.