The Braun replacement foil and cutter block combo pack 54B consists of a complete foil and cutter block cartridge. A Braun shaver cuts an average of 6 million hairs within 18 months. Over time, the cutting components wear down, which can lead to a less comfortable shave. Braun therefore recommends replacing the foil and cutter block of your shaver every 18 months to maintain optimal results. Take care of your shaver, and it will take care of you. Blade cutting head with 3 flexible blades Recommended replacement after 18 months Compatible with Braun Series 5 shavers of generations 50, 51 and 52 Operation: Quick and easy exchange Notes: Easy cleaning under running water Safety instructions: Potential safety risks include cuts, skin irritation, electric shock, bacterial growth, and misuse near water or while charging. Please observe standard safety precautions for electric shavers.