・Compatible electric shaver replacement head. Fits Series 5 models 53B, 51-M1200s-V, 50-B1000s, 50-B7000cc, 50-M1000s, 50-M4200cs, 50-R1000s, 50-W1000s, 60-B1000s, 60-B4000cs, 60B 7000cc, 60-N1000s, 60-N4000cs, 60-R4200cs (same as 60-R4200cs). Made of stainless steel. The blades are very sharp. Can be used for up to 18 months under normal conditions. Integrated foil and cutter cassette type. Replacing both the foil and cutter at the same time provides a shave like new. Compatible with Series 5 53B electric shaver heads. No need to worry about compatibility issues. Please identify your model. ・【Product Description】One replacement head for electric shavers. Color: Black.