30 Dark Black Smooth Card Sheets - 100# (100 lb/pound) - 11" X 17" (11X17 Inches) Tabloid|Ledger|Booklet Size - Cover Weight Fine Paper for Quality Results on a Smooth Finish 100# CARDSTOCK Cover is about 3 1/2 times as thick as a sheet of 20# printer paper. 271 gsm (grams per square meter). Calipers at .0128 inches. DARK BLACK COLOR paper with a smooth surface. High tech milling. Ultra dark color. The SURFACE is smooth, making this paper good for invitation & announcement cards Recycled paper with 30% post consumer waste - good for keepsakes THOUSANDS of HAPPY CUSTOMERS have appreciated the quality paper and good service we provide.