Specially coated Black Poster Board designed for use with chalk and chalk markers. Durable 18 pt. board has a Dark Black coating that provides great contrast with white and colored chalk. Wipes clean with damp cloth, or felt eraser creates a worn chalkboard-look. Easy to customize for signs, posters and photography props. Acid free. Recyclable. Each board is 22" x 28". Includes 25 sheets.