Quality, 85% calcium carbonate chalk makes writing with chalk a breeze. Chalk writes smooth visible lines without the mess. Erasing is easy and dustless. Recommended for composition boards only. Choose White, Yellow or Assorted. Box/12 sticks or 144 sticks in a reclosable box. Includes: White, Yellow and Assorted colors. Pack of 12. High quality 85% pure calcium carbonate. Writes smooth visible lines without the messy dust. Erases cleanly without ghosting. Certified AP non-toxic.