Compatible Model: 52B Fits For Braun Series 5 Models: 5020, 5020s, 5030, 5030s, 5040, 5040s, 5050, 5050cc, 5070, 5070cc, 5090, 5090cc Item Description: Shaver foils & cutter blocks are precision parts that in time are subject to wear. This wear is dependent on your shaving method & beard type. To maintain optimal shaving performance, recommend that you should clean the shaving parts regularly with cleaning agents and replace the foil & cutter block every 18 months. Get back 100% performance on yourshaver for a fraction of the original cost Compatible with old and new generation Series 5 (5040s, 5030s, 5020s) Small investment, perfect performance. Within 18 months, your shaver will cut an average of 6,000,000 hairs. In accomplishing this substantial task, the cut parts will gradually wear out and your shave may become less close and comfortable. That's why recommends changing your shavers foil and cutter block every 18 months to maintain your shavers perfect performance. For an efficient shave every day.