What Half Face Blades says:
SHPOS monolithic folding blade, Gen 3. Blade geometry has been optimized for cutting, not prying or digging. 

Body - Machined solid billet 6AL-4V Titanium Type 2 anodizing. The body is a true monolithic frame which eliminates the need for backspacers, stand offs or additional hardware while gaining strength and rigidity.

Blade – S45VN stainless steel (58-59 RHC) with a proprietary heat treat to bond with a nitride coating (62 RHC).

Lock Up – Tapered button lock and bushing coated with nitride finish to wear evenly with the blade. System will wear “in” with use, not wear “out”. The longer the blade is used, the tighter the lock up will get. Push button blade lock release has a break in period.

Pivot System – Dual, sealed roller bearings press fit into the frame. Pivot pin is captive to the blade and bearings eliminating all play in lock up and close. Dual bearing pivot system maximizes stability, while reducing friction in opening of blade.

Pocket Clip – Type 3 anodized aluminum pocket clip designed to be reversible on both sides of the body. Custom opposing inserts fill the gap to eliminate exposed threaded holes.