At a scant 2 inches in overall length, this cute precision machined Micro Pen will barely be noticeable hanging on your keys. Shorter and lighter than most keys, you won't know it's there... until you need it. Stainless Steel Nano Clip is standard for quick and easy access. But don't let the size fool you. This pen is rugged and sturdy and is built to last. The threaded assembly incorporates the use of o-rings to securely hold the the caps in place. The pen body unscrews from the cap and can then be slipped into the cap to lengthen and facilitate pen use. Machined from solid brass in the USA. Uses Cross Matrix Mini Ballpoint refills. 2 Inches Hanging Length 2 5/8 Inches Writing Length