Tuff-Writer Tactical Pens are designed to withstand whatever you can and then some. As their name suggests, these aren't your ordinary writing utensils...these are tough! Tuff-Writer has made it their mission to produce the most dependable tactical pen on the planet in the USA with the finest materials and craftsmanship. Built to perform even in the harshest conditions where other pens fail. Temperatures from -30 to 250 degrees Fahrenheit and altitudes of 12,500 feet, these go-anywhere writers also function as an excellent defense implement or control device. Tuff-Writer stands by their quality products with a lifetime warranty guaranteeing they will operate without fail for their duration. Whether you depend on your gear for your life or you're looking for a quality EDC writer, trust a Tuff-Writer pen without fail.