The Philips Norelco TripleTrack HQ9 Shaving Heads feature three XL shaving tracks and uses Super Lift & Cut shaving technology to ensure a quick, close, and comfortable shave below skin level. Its Reflex Action system automatically adjusts to every curve of your face and neck for a precision shave. Using its Precision Cutting System, this device offers a clean shave for long hair and short stubble. It is compatible with shavers from the 8138X, 8140XL, 8150XL, 8151XL, 8160XL, 8171XL, 8175XL, 8240XL, 8250XL, 8251XL, 8260XL, 8270XL, 8280XL, 9160XL, 9170XL, 9171XL, 9190XL, 9195XL, and 9199XL series.