Wonder Stix are washable and odorless, plus dust- and cap-free! They offer bright, permanent color on wood, cardboard, paper and poster board. Also great for use on glass, windows and white boards - just wipe with a damp cloth to remove. Set includes 8 Wonder Stix plus 4 black playmats that can be used again and again. Playmats measure 8-1/2 x 12".