This kit includes: Philips Smartclean Replacement Cartridges (2 pack) Compatible with all Philips Norelco or Philips Shavers using the SmartClean System such as; Series 5000: S5370/84, Series 7000: S7370/84, S7371/84, S7720/85, Series 8000: S8950/90, Series 9000: S9311/84 & S9721/84 Wet & dry Electric Shavers