Compatible models of the S5 series: Suitable for S5531, S5532, S5533, S5536, S5585, S5587, S5588, S5666, S5799, S5830, S5999, S5831, S5832, S5833. Please refer to the back of the shaving handle to confirm the replacement head. Compatible models S7, S8, S9: Suitable for S7731, S7732, S7733, S7735, S7783, S7786, S7888, S8050, S8850, S9931, S9932, S9933, S9935, S9936, S9985, S9987, S9502. Please refer to the back of the shaving handle to confirm the replacement head. Compatible models SU/SP series: Suitable for SU5579, SU5588, SU5599, SU5799, SU5999, SP9870, SP9871, SP9873, SP9830, SP9883, SP9890. Please refer to the back of the shaving handle to confirm the replacement head. Highly efficient shaving: The blade grille of the replacement head features a precise cutting system. 360-degree design with no blind spots. Gently removes hair without pain for a cleaner result, while the rounded head design helps protect skin from irritation. Why replace razor heads? Maintain a sharp and effective shave. Regular replacement ensures better hygiene and optimal shaving performance.