Braun 52s replacement foil and cutter cassette multi silver bless combo pack compatible with all series 9 electric shavers. Small investment, peak performance. Get back 100 percent performance on your braun electric shaver for a fraction of the original cost. Within 18 months, your braun shaver will cut an average of 6,000,000 hairs. In accomplishing this substantial task, the cutting parts will gradually wear out and your shave may become less close and comfortable. That is why braun recommends changing your shaver's foil and cutter block every 18 months to maintain your shaver's maximum performance. For an efficient shave every day.