"AI" are Yatsuo Washi and were originally kozo sold at Aiko's, a pioneer brick and mortar in bringing washi to the United States, formerly in Chicago.

These single dyed kozo, or Japanese mulberry papers, are ideal for box liners or end papers for books and definitely for printmaking.

Measures 25 x 37 inches, i 45g/m².

This version of white kozo is very similar  https://shop.paperconnection.com/collections/kozo-dyed/products/color-kozo-white-ck-58