UltiFlex is a weapon manufacturer that specializes in creating military-grade combat knives. Founded in SEY 2538, the company rose to prominence after the knives it was contracted to make for the United Planets of Earth (UPE) Army were utilized during the First Tevarin War. UltiFlex retained its contract after the government reorganized into the United Empire of Earth (UEE) in 2546. After four decades of exclusive work for the government, UltiFlex expanded its operations to the public sector. The UltiFlex name is synonymous with their flagship product, the FSK-8 Combat Knife. These combat knives are part of the standard field kit for UEE soldiers and are popular among civilian survivalists.