[High Precision Cutting System]: This SH90 replacement head are dual precision cutting system with lift and cut technology,360 degrees without dead ends.Compatible With for replacement heads 9000 series Gently remove your beard, painless and cleaner, the round head design perfectly protects your skin from scratches. [Comfortable Close Face Touch]: The upgraded RQ12 Replacement heads for series 9000 shaver have an ultra-thin head, with a slot for shaving long beards, and a hole for shaving the shortest stubble,for s9000 replacement head, that there is no residue after shaving. [Easy Replacement & Installation]: SH90 replacement head for s9000 replacement head easy to and replace a new head- just two minutes,After installation, put a drop of oil on each nozzle and run for 10 seconds to get the best experience,It's recommended that you replace the shaving head every 12 months to get the max shave performance. Fitment: S9911 S9731 S9711 S9511 S9111 S9031 S9988 S9151 Suitable for: All rq10