The ESEE-5 is a knife that can handle even the roughest survival situations. Designed By Military SERE Instructors as a hard-use downed pilot's essential survival knife. The ESEE-5 is a full tang 1095 high carbon steel construction with a black powder coated flat ground 5.25" blade. This blade features jimping on the spine for increased thumb grip. The Handle is made out of tan Micarta canvas, and features a glass breaker on the pommel. Includes a durable polymer molded sheath with removable clip. Carbon steel knives are preferred by those who want a sharp, long-lasting edge. With use, a carbon steel blade will develop a distinctive dark finish. This is not a defect, but a natural result of the use of high-carbon steel. Carbon steel blades are not dishwasher safe, never let them sit in water for a long time, but rather hand-wash and dry your knives to avoid rusting.