Personna Regular-Duty Single Edge Razor Blades 100 Packs Of 5 Blades In JarAmerican Line branded top quality regular duty carbon steel single edge razor blades with an aluminium spine that are ideal to fit into a scraper tool. For hand use they have the advantage that the blade can be bent to the contour of a convex surface for effective cleaning (e. g. windscreens). A carbon steel single edge blade with an aluminium spine. It is supplied in a jar merchandiser containing 100 packs of 5 blades.