[Ref The Pilot’s Manual PM2 Ground School Page 46, FAA-H-8083-25B Page 5-25, Wiki, Boldmethod]
Stall strips is a fixed device employed on the leading edge of fixed-wing aircraft to introduce a stall prematurely
Stall strips are used to initiate flow separation at chosen locations on the wing during high-angle of attack flight, they act as a warning before the wings actually entering a full stall.
Read More from Wiki or Boldmethod.
Stall stips ≠ vortex generators !
Sweepback and Taper wing – Stalling at the wing tip first