Slice® SPG10526 blades are designed for use exclusively in Slice utility knives. Made of 100 percent zirconium oxide, Slice safety blades retain their sharpness 11 times longer than steel blades. Because of our proprietary manufacturing and sharpening process, they also feature a finger-friendly® edge. Slice replacement utility blades are non-magnetic and require no special oil coating or maintenance. Choose a rounded-tip blade for extra protection against accidental punctures.