Stability JY Pro was developed by Jack Yan and published by JY&A. Integrity JY Pro consists of 6 designs and household bundle options. p > Because of the requirement for a new condensed serif typeface household, Jack Yan developed this individualistic design of typefaces complete with among the largest collections of unusual ligatures available at the time of launch in the mid-1990s. In addition to the typical choice of double-f and ct, JY&A has supplied gr, gt, ty, and other ligatures for JY Stability Roman and Italic.