?Replacement Recommendation?Pack of 1 Series 7 replacement blades. To maintain an optimal shave, it is recommended that the razor head be cleaned regularly and replaced every 18 months. ?Easy Installation?Remove the old cutterhead by pushing it from the front to the back, and then press the new cutterhead directly into the empty space, the installation is successful. ?Usage Scenario?Wet and dry environment brings you a more comfortable shaving experience. ?Perfect Designed?Unique foil pattern captures hairs growing from different directions for a close shave with fewer strokes. ?Compatible Models?70S shaver head compatible with braun shaver series 7 for 720, 730, 760, 790, 799, 797, 750cc, 760cc, 790cc, 795cc, 799cc and support with 9000 Series.