This package of two High Profile TripleTrack Replacement Blades is from Fiskars. These titanium blades are Style I and are compatible with any Fiskars Trimmer featuring the Fiskars TripleTrack System (sold separately). These titanium blades stay sharp longer because they have a titanium blade coating that is three times harder than steel. This resists wear, scratches, and corrosion. These blades also have a high-profile grip for easier grasp so your hands do not get sore from repeated use.