The SOG Flash I 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. A bayonet style reversible clip is mounted on the end of the handle, and an integrated safety is included to prevent accidental opening.