Let your imagination take off with Astrobrights Colored Cardstock in Happy Assortment. In this pack of 250 sheets you can create dazzling postcards booklet covers presentation bindings and paper crafting. Our colored cardstock is thick enough to stand up to frequent handling yet smooth enough to work with inkjet and laser printers. Plus it s lignin and acid-free so it won t yellow over time. Brighter colors. Brighter ideas.