Reset your Philips shaver back to new with the SH90/60 Shaving Heads that will deliver consistent, accurate performance for another 2 years. These V-Track Precision Pro Blades gently position each hair in the best cutting position, including flat-lying hairs and hairs of different lengths. They cut 30% closer in fewer strokes, while leaving your skin in great condition. Re-attaching your new shaving heads is quick and straightforward. Once they're in place, simply hold down the on/off button on your shaver for more than 7 seconds to reset your replacement reminder, if your shaver has one. Compatible with Philips series 9000 and 8000.