Compatible models: 50-B1000s, 50-M1000s, 50-R1000s, 50-W1000s, 50-B1200S, 50-M1200S, 50-R1200S, 50-W1200S, 50-M4200cs, 50-M4500cs, 50-B7000cc, 51-M1200S, 51-W1200S, 51-M4500cs, 51-W7000cc, 51-B7200cc, 51-R7200cc, 60-B1000s, 60-N1000s, 60-B4000cs, 60-N4000cs, 60-R4200cs, 60-B7000cc, and others. Made of stainless steel. The blades are very sharp. It is recommended to replace the blades every 12 months under normal use, as a guideline. Replacement within this period is recommended to maintain a comfortable shave. Shaver blades are consumables. Fine chipping and unevenness can occur on the mesh and blades with daily use, gradually reducing the sharpness. The metal mesh cover of the shaver blade has over 2000 nano-level micro-holes that capture hairs growing in various directions and shave them from the root. This allows for a closer, cleaner shave than before, with better skin contact. [Note] This is a compatible product for the integrated foil and cutter cassette F/C53B.