Model No. 6000. Fits Model No.: 6550, 6525, 6520, 6515, 6510, 5515, 5510, 5416, 5415, 5414, 5315, 5314, 5312, 5311, 5005. Replace your foil and cutter block every 18 months to get a 25% better shave. (Overall evaluation from Braun users comparing their shave with new parts and those used for 18 months). To maintain optimum shaving performance, Braun also recommends cleaning both regularly with Braun cleaning agents.