Technical features for Philips Norelco replacement head HQ9 for AT900 series, 8100 series, 8200 series, and 9100 series. Speed-XL shaving heads for a fast and close shave. The three shaving tracks offer 50% more shaving surface for a fast and close shave. Compared to standard rotary shaving heads. Super lift & cut dual blade system of your Philips Norelco shaver first blade lifts, and second blade cuts for a comfortable close shave. Precision cutting system the Philips Norelco shaver has ultra-thin heads with slots to shave long hairs and holes to shave the shortest stubble. The Norelco HQ9 are replacement shaving heads that fit Norelco 7140XL, 8140XL, 8150XL, 8160XLCC, 8170XL, 9160XL, 9170XLCC, and 9190XL models. The Norelco HQ9 has stainless-steel blades for a comfortably close shave.