Tactical Stealth Pen Pro by Atomic Bear (bonus)
This tactical pen by @TheAtomicBear is a modern-day Yawara for self defense. Made of light but strong material with a serrated end. And a pointed tungsten carbide glass breaker, hidden under a stiff silicone cap. Of course, the pen also has the ability to write.
You can shop pens here: https://theatomicbear.com/?ref=bcahiufk
Special coupon code for 20% off: BujinClub