Clover's single-sided paper chalk. Blue: 2 sheets (new and unused) Red: 1 sheet (approximately 20% used; the used portion will be cut off, and the clean part will be sent.) Purchased about 4 years ago, and stored in a dark place after use. I tested the red one on the originally used part, and it worked without any problems. I think the blue ones can also be used. To prevent damage during delivery, I will pack them between thick cardboard. Please purchase only if you agree to the above.