Each typeface group has eight weights: 018 Ultra Light, 036 Extra Light, 054 Light, 072 Regular, 090 Medium, 108 Bold, 124 Heavy, 144 Black. Cap-height, x-height, ascent and descent measurements are identical across all ThreeSix typefaces. In each typeface group, the vertical strokes of all weights align on a central axis and weight is applied as an increase or decrease on the stroke axis in 18 unit steps. In this way, all letterform contours within each typeface group map onto each other precisely.