ESEE Knives make a series known as the 3, 4, 5, and 6. These knives all have a similar style and purpose. Their goal in existence is to survive. The ESEE 4 is known as the wilderness version of the ESEE 3. It is a little longer, measuring in at 9 inches, and a little thicker on the spine. Other than that the 4 is almost the same knife as the 3. The 4 is built from 1095 steel and its handle can be found in Canvas Micarata, G10, or Linen Micarta.