The weight axis (wght)

Of the 558 variable families in the library, 545 have a weight axis (wght). Weight runs from thin to heavy strokes on the usual 100 to 900 scale. The most common range is 100 to 900, used by 185 of them. Sans serifs account for 297. The earliest-dated family with this axis today is Inconsolata, added in 2010; the date is when the family joined, not when it became variable.