Restore 100% of your shaver's performance. Compatible with old and new generations of Series 7 (799cc, 795cc, 790cc-4, 760cc, 750cc, 735s, 730) and Pulsonic. Simply replace your Braun shaving parts every 18 months to maintain peak performance. Small investment, maximum performance. For optimal performance, clean regularly. Within 18 months, your Braun shaver will have cut an average of 6,000,000 hairs. To accomplish this significant task, the cutting elements will gradually wear out and your shave may become less close and comfortable. That's why Braun recommends replacing your shaver foil and cutter block every 18 months to maintain your shaver's top performance. For an efficient shave every day. How to replace your shaver head: For older models that have a foil and a cutter block as two independent parts, you need to replace the parts in two steps: First, remove the foil, either by pressing the release button if your shaver has one or by pulling the foil. Then, rotate the cutter block 90 degrees and pull it off, holding it by the ends to avoid touching the blades. To reassemble the parts, simply perform the same procedure in reverse order.