The SOG Flash I model SGFSA-97 has an assisted blade that opens fast when the user pushes the thumb studs. The blade is made of AUS 8 stainless steel and is partially serrated so you get the best of both worlds. The knife is held open by a piston lock system that can be seen in the handle. Pull the sliding button and the blade folds back nicely. What sets this particular SOG knife apart from the other Flash I models is that it has a hard anodized aluminum handle. A bayonet style reversible clip is mounted on the end of the handle, and an integrated safety is included to prevent accidental opening.