In addition to a new name – the Stimulus 3551 – the updated 3550 Pardue model features improved reliability and a larger push button. It maintains the stylish spear point blade shape and compact 6061-T6 aluminum handle, equipped with safety and reversible right hand carry pocket clip. The small size of the Stimulus gives it an advantage in everyday carry comfort for military and law enforcement officers.

The Stimulus 3551 has a satin finished blade with a plain cutting edge.