This is the Atomic Aquatics Titanium Ti6 Scuba Diving Knife Blunt and Pointed Tip Dive Knife Options Features Corrosion-resistant full-tang Titanium blade Elegantly curved 4-inch cutting edge Serrated edge and large line-cutting notch Lightweight locking sheath with push-button release Quick-adjust sheath straps Available with blunt or pointed tip One of the biggest problems with dive knives is corrosion and Atomic solves that issue with a beautifully crafted and honed full-tang Titanium blade.