These blades are one of three types that are designed to fit the OLFA X-DESIGN range of XSR scrapers. This 100mm wide x 0.5mm thick blade has both a sharp side and a blunt side

Use either side, dependent on the substrate being removed in question. For example, you might want to use the blunt side for stripping wallpaper, so as to not damage the wall behind, or the the sharp side for taking off vinyl floor tiles. These blades undergo an advanced production process that gives them superior durability.