HP Spectre x2 is a true 2:1 detachable that delivers the crucial functionalities of a notebook with the portability of a tablet. HP designed a chassis with the thinnest possible walls without sacrificing strength or performance of the tablet. Another key objective was to create a 2-in-1 that is truly a notebook replacement. Essential to this mission was keyboard that could compete with the best of the notebooks in the market. As such, the Spectre X2 uses a structurally sound aluminum chassis and uses 2.5mm key travel.