Its smooth, hard finish offers excellent printability, whether you use ink or toner. IN fact, Digital Index carries our Electronic Imaging Guarantee. Good ink holdout, snap and resistance. Exceptional die-cutting, scoring and folding characteristics. Attractive blue-white, white shade for good image contrast. 90 lb. Index white meets US Postal regulations for 7 pt reply cards. 110 lb. Index white meets US Postal regulations for 9 pt reply cards. Acid-free for added archival quality that extends the life of the document.