Sharpened to a razors edge, this knife blade consists of 3CR13 stainless steel. The blue swirl deploys as a switchblade, or a manual opener. The switchblade functionality is used via rotating the hidden switch. You can also open it manually with the thumb stud. Once deployed, the blade locks into position and holds it's ground very well. This is a very sharp knife with a hard steel type. Overall Length: 7 Inches. Blade Length: 2.94 Inches. Blade: Drop Point, Black Finish (Electrolytic). Blade Thickness: 2.95mm. Blade Steel: 3Cr13. Hardness: appx. HRC54. Handle: 3.9 Inches, Blue & Black Marbled ABS. Deployment: Hidden Release, Dual Action, Auto, Folding. Features: Very Hard Steel, Very Sharp Blade. These come with an adjustment screw on the side of the knife to adjust the tension you want on the blade.