This compact knife is made of truly rust proof steel. Just rinse it after the dive and you are done. The serrated edge is the best edge design for a dive knife because it cuts rope and lines easily when a straight edge just rolls over the material. Mounted on power inflator hose it is always easy to reach, with either hand, in a hurry. Sheath can be easily moved to another hose if desired by removing the screw mount plate on the back of the sheath. Power inflator hose IS included and is in fine condition.