Sharpened to a razors edge, this knife blade consists of 3CR13 stainless steel partial serration. The hardness for the blade is approximately HRC54, meaning it is harder than 440 stainless. The Tiger Swirl knife is a high quality folding knife, but there is more to it than meets the eye. The switchblade functionality is used via rotating the hidden switch. You can also open it manually with the thumb stud. The manual open feature provides this knife with a stealthy operation. Usually, holding this knife makes you think it is a regular manual opening knife, but discretely it is a switchblade.The powerful switchblade hidden release is fast enough for immediate deployment. Once deployed, the blade locks into position and holds its ground very well. We have tested the deployed blade lock and it has succeeded where other Automatic Knives have failed. This is a very sharp knife with a hard steel blade (3CR13 HRC54). It will have fewer sharpening sessions and hold its razor sharp edge longer. The handle offers complex swirl acrylic design insert onto a steel wall. Overall Length: 7 Inches. These come with an adjustment screw on the side of the knife to adjust the tension you want on the blade