Description As a tribute to the fire brigade in the USA, Spyderco presents the knives of the Thin Red Line series. The popular Endura 4 Lightweight has a spacer in a bright red, which stands out against the black FRN handle. The blade is made of solid VG-10 with a partially serrated edge. The typical Spyderco thumb hole, the solid backlock and the four-position convertible clip make the knife extremely suitable for everyday use.