The UZI Tactical Defender Pen 6 features a hidden handcuff key that is accessed by removing the breaker cap. This pen has a gunmetal gray finished aluminum body with glass breaker tip and a pocket clip for carry. Retractable pen tip; twist to open and close. Writes well and has an available replacement pen ink cartridge.
Nice machining and finishing, particularly for the price. Not sure that they handcuff key is something I'll ever use, but as a writing instrument it does the job. It's perhaps a bit short (at least in my hand) and light for a true self-defense weapon, but I think it will spend a lot more time writing than breaking glass or fighting of ninjas, so that's not a big issue.
It's not so large to where it's not uncomfortable to write with, (with large hands) and it's not too small to where it lacks grip. Very cool pen that could come with a better ink cartridge. The ink cartridge it comes with is subpar, and i would recommend investing in another ink cartridge. Otherwise, great pen.