10 Self-Defense Weapons To Keep In Your Car Pepper Spray. When you think of self-defense tools, one of the first things that pop into your mind is probably pepper spray. ... TASER Device or Stun Gun. ... Knife. ... Tactical Pen. ... Self-Defense Key Chain. ... Personal Safety Alarm. ... Self-Defense Ring. ... Lipstick Stun Gun. More items... 23 Aug 2018