Norelco SH91/52 Replacement Blades for Shaver Series 9000 and SP9000 Prestige – Self-Sharpening Precision BladesOverview Refresh your grooming routine with the Norelco SH91 52 replacement blades, crafted for Series 9000 and SP9000 Prestige razors. These blades leverage a self sharpening design to help maintain a precise edge, delivering a smooth, close shave when you need it most. The set includes three cutters and compatible combs, giving you flexibility across different facial contours. Whats in the box Replacement blades Self sharpening mechanism Three