Skia is a stylish sans serif face originally built as a showcase for Apple’s QuickDraw GX technology, and as such has variable weight and width axes. Like a multiple master font, users with the correct software could fine-tune weight and width using sliders in their applications.

The font includes old-style numerals, inferior and superior numbers and letters, fractions, and ligatures, demonstrating the richness of character set that such fonts can contain.

In later versions of Mac OS X, Apple replaced the single variable font with 10 conventional styles.