Philips SH50/50 Shaver Series 5000 Replacement Shaving Head has three dynamic parts that move independently, flexing outward, pivoting around and tilting inward to follow the natural contours of your face. Philips heads let you shave any way you want. The Aquatec seal gives you the option of either a comfortable dry shave or a refreshing wet shave with shaving cream or gel. The replacement shaving unit is equipped with the patented Super Lift and Cut System which is designed to give you a close and comfortable shave as the first blade lifts while the second blade cuts comfortably below skin level. The latest Philips shavers have an inbuilt replacement reminder in the form of a shaving unit symbol. This symbol will light up and indicate when to replace the shaving heads.