Compatible models of the S5 series: Suitable for S5531, S5532, S5533, S5536, S5585, S5587, S5588, S5666, S5799, S5830, S5999, S5831, S5832, S5833. 5, S585536. 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, S9935. 99936 , 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 has a precise cutting system. 360 degree design without blind spot. Gently removes hair without pain for a cleaner result, while the round head design perfectly protects your skin from scratches. Why replace razor heads? Keep your shave perfectly sharp without fear of slow heads. Regular replacement is more hygienic and offers you an optimal experience.