Replacement blade for Braun Series X: extend the lifetime of your device by replacing your blade every 6 months 4D-Blade technology: one blade with 4 cutting elements—consisting of 2 side trimmers and 2 central shaving zones. Using 450 movements per second, it shaves close enough to look great, while staying gentle on skin Skin protection: caged blade technology protects the skin from the blade, so you can comfortably shave and trim even in delicate areas Built to last longer: the 4D-Blade is made from 100 percentage stainless steel and stays sharp for up to 6 months. It's also 100 percentage waterproof and easy to clean, for hygienic use at home Precision and control, with confidence: the pivoting Flex head adapts to your facial contours to efficiently catch hairs. The 4D-Blade design allows you to shape and edge your style, no matter your skill level