The Philips 422203625841 (SH50/50) is a set of three replacement shaving heads designed for Philips Series 5000 electric shavers. These heads feature MultiPrecision blades that lift and cut both long and short hairs for a fast and close shave. The Super Lift & Cut Action system lifts hairs to cut comfortably close, ensuring a smooth shaving experience. Philips recommends replacing the shaving heads every two years for optimal performance.