[compatibility]: SH90 Replacement Heads Compatible with norelco series 9000 replacement heads,for sh90 series s9000 prestige (S9311/27, S9311/84, S9311/87, S9321/88, S9511/63, S9531/84, S9721/84, S9721/87, S9721/89). Series 8950 (S8950/50, S8950/91). for Star Wars Special Edition (SW6700/91, SW9700/83) electric shavers. [360 Degrees without Dead Ends]:for norelco series 9000 replacement heads,Remove your beard gently, painlessly and more clean, for philips norelco 9000 replacement blades round head design perfectly protect your skin from scratching. [Comfort shave]:Blades for s9000 prestige replacement head whoes rounded edges move smoothly over skin for a protective shave,for philips sh90 replacement heads, get a comfortable dry and wet shaving experience. [Easy Installation]:This for philips norelco sh90 replacement heads,Easy to install, simple steps, you'll be able to effortlessly replace the old heads with the new ones in no time. [Suggestion]:Recommend that replace sh90 shaving heads every 12 months for best performance,Product includes only 3 pcs sh90 replacement heads and 1pcs cleaning brush. [Tips]:After installation, place a tiny drop of baby oil on each sh90 series replacement heads and allow the shaver to run 10 seconds. These steps will help to ensure your shaver to run properly and smoothly. [Tips]:After installation, place a tiny drop of baby oil on each sh90 series replacement heads and allow the shaver to run 10 seconds. These steps will help to ensure your shaver to run properly and smoothly.