Mixed blade sets, which is the sensible way to stock a jigsaw. One set covers wood in a spread of pitches and lengths; the others mix wood, plastics and metal, or plastics, metal and building materials, so whatever turns up on site is covered. Buying a set rather than singles avoids the usual outcome — the right blade is the one you don't have, and the wrong blade gets used anyway.
Compare products and choose the right one for your work.