Havalon set out to make the most versatile knife around, and the Hydra measures up by offering 7 unique blade options for the double-blade system (2.875" & 4.625"). The Hydra includes a total of 17 replacement blades and a black nylon carrying case to house it all. Its double-blade design allows you to keep your two most used blades at the ready, and the thumb tab on each blade lends itself to one-hand opening. The red anodized aluminum handle has black rubber grip inlays and an open back design for ease of cleaning. You'll appreciate the wide variety of chores the Hydra can accomplish, not to mention the fact that you'll never need to sharpen the blades.