PROXXON 28054 Jigsaw blades in Special Steel, Black, 2 Piece Specially designed for use with the Jig Saw STS 12/E and the Super Jig Saw SS 115/E Made from a special steel, these blades are used on hard & soft woods, plywood, fiberglass reinforced sheets, as well as various forms of plastics Ideal for tight curves and clean cuts