Fiskars Low Profile TripleTrack Cutting Blades feature durable steel blades that stay sharp longer for lasting performance. Blade style I. Designed to work with Fiskars TripleTrack Personal Paper Trimmers only. The cutting blade cuts up to five sheets of 20lb paper or two sheets of heavier cardstock. The unique TripleTrack rail design allows the blade carriage and rail to interlock; making straighter and more precise cuts. This package contains two cutting blade carriages. Caution: Sharp edge. Handle with care. (Compatible with items 152490 154540 154450 154460 and 177560). Includes two (2) cutting blades.