Technical Features for Norelco HQ9 (2 Pack) <BR>Norelco HQ9 Replacement Head <BR>For AT900 series, 8100 series, 8200 series, 9100 series. <BR>TripleTrack <BR>Super Lift & Cut <BR>Precision Cutting System <BR><B>Speed-XL shaving heads for a fast and close shave</B> <BR>The three shaving tracks offer 50% more shaving surface for a fast and close shave. *compared to standard rotary shaving heads. <BR><B>Super Lift & Cut</B> <BR>Dual blade system of your Philips shaver: first blade lifts, second blade cuts for a comfortable close shave. <BR><B>Precision Cutting System</B> <BR>The Philips shaver has ultra thin heads with slots to shave long hairs and holes to shave the shortest stubble. <BR><BR> The Norelco HQ9 are replacement shaving heads that fit Norelco 7140XL, 8140XL, 8150XL, 8160XLCC, 8170XL, 9160XL, 9170XLCC, 9190XL models. The Norelco HQ9 has stainless steel blades for comfortably close shave.