The Rapid Response 3.90 utilizes the Blade Assist Technology. This spring assisted design uses a friction-reducing roller-bearing design to allow the blade to open quickly but smoothly while reducing spring load on all internal blade-assist components. The blade is bead blast finished stainless steel with a plain edge and dual thumb studs for one-hand opening. The handle is built on stainless steel liners and features textured fiberglass-filled nylon scales and a simple liner lock tab. The Rapid Response has the Max-Lock™ safety button on the side of the knife’s handle; it can lock the blade in both the open and closed positions. The deep tip-up carry pocket clip is reversible. Ron Lake design.