Remington SP25 Microflex Replacement Heads and Cutters The cutting edge. Get peak performance out of your razor with this set of replacement heads and cutters. Featuring ultrathin ComfortFlex heads that contour to your face for a comfortably close shave. In fact they have 50 percent more cutting slots than standard shavers so you get a quick shave in fewer passes which in turn means less irritation. With titaniumcoated twinblade technology that maintains peak performance longer. Includes three heads and cutters. Plus easytofollow instructions on the package make replacing your dull heads quick and effortless. Fits the following model numbers R200 R225, R400 R425 R450 and WR5000.