CORE'DINATIONS-Core Essentials Cardstock Assortment. Sand it; Tear it; Antique it! These are only a few ideas of what you can do with this wonderful paper. Each canvas textured sheet has one outer color with a coordinating or contrasting core color that is revealed using any of the creative techniques that remove the outer layers. This package contains thirty 12x12 inch acid and lignin free sheets: 3 each in 10 colors. Available in several color sets (each sold separately). Imported.