This REAL Self Defense Writing Pen has a pointed glass breaker tip and a tactical screw cap that can be used in a self defense situation to jab or stab. It also has a bright 100 lumen flashlight that runs on 3 LR754 button cell batteries that are included. The flashlight end also has a jagged edge that can be jabbed or scraped against an attacker to collect DNA. The writing pen measures 6 1/4 inches long x 1/2 inch in diameter. This writing pen is great for anyone to carry including college students and office workers.