Extremely Thin At only 0.056mm, this 73S for Braun series 7 replacement head has a negligible thickness, fits perfectly against the skin, and shaves beards are so much shorter that you don't feel their presence. Thereby reducing the number of shaves you need and saving your precious time Easy to Clean You just need to remove theses 73S blads for braun series 7 replacement heads and rinse it with water. But need to pay attention, wipe dry in time after rinsing and put it in a dry place to avoid rust or damage New Geometric Knife Mesh Design The mesh of this 73S & cutter for Braun s7 replacement head applied 4 shapes, 5 directions, and 20 angles to capture beards, which can capture more beards at one time, thus reducing the number of reciprocations and compatible with new generation series 7 s as the following models: 70-N1300S/70-N1000S/70-S4200cs/70-B7200cc/70-N4300cs/70-B4320cs/70-S7300cc/70-S7001cc/5018S 5020S 5035s 5049s 5050cs/6075cc 6020s 6040cs 6072cc 6075cc 6090cc/7020s 7025s 7027cs 7071cc 7075cc/7085cc 7089cc Simple to Remove and Install Firstly, remove the old knife head of the for Braun series 7 replacement head, and pull the knife net upwards. Then Align the new knife net with the card slot and put it on the sleeve. Finally, Press the reset button. Only need three simple steps to have a new knife head