S5 Series Compatible Models: Compatible with S5531, S5532, S5533, S5536, S5585, S5587, S5588, S5666, S5799, S5830, S5999, S5831, S5832, S5833.5, S585536. Please refer to the back of the shaver handle to confirm replacement heads. S7, S8, S9 Compatible Models: Compatible with S7731, S7732, S7733, S7735, S7783, S7786, S7888, S8050, S8850, S9931, S9932, S9933, S9935, S9936, S9985, S9987, and S9502. Please refer to the back of the shaver handle to confirm replacement heads. 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 shaver handle to confirm replacement heads. Efficient Shaving: The blade grid of the replacement heads features a precise cutting system. A 360-degree, no-blind-zone design ensures gentle and painless hair removal for a cleaner finish. The rounded heads perfectly protect your skin from scratches. Why replace shaver heads? Maintain a sharp shave without worrying about head wear. Regular replacement is more hygienic and provides the best shaving experience. Note: Packaging may vary depending on the batch; the packaging you receive may not be the same as the one in the main image. Note: The heads in this link do not include the base. For a complete set with a base, you need to purchase it from another link.