The TRE or "Three Rapid Exchange" system is was the blade show 2015 innovative knife of the year. Lionsteel has made something here that can appeal to almost everyone. Do you like a flipper? Leave the flipper tab on. Flipper not your style? Remove the flipper tab and add a thumb stud. Leave both off and keep a naked style knife. Either way the blade will deploy on the IKBS bearing system quickly and efficiently. The handle is a milled 3D titanium and is some of the best quality production out there.