Sheets are 65 lb cardstock and feature a solid dyed core. Acid-free. Assortment packs include 4 sheets each of 5 coordinating colors. DARICE- Core’dinations Collections: Premium Cardstock Great White. Sand it, tear it, emboss it, LOVE it. This package contains twenty identical sheets of 12×12 inch smooth texture cardstock paper. Acid free. Imported.