Double Sided Mosaic Squares can be used for many arts and crafts projects. Use on posters, paper, and even masks!. 10, 000 pieces per package and cut from stiff cardboard (paper). Great for arts and crafts 10,000 mosaic pieces, 0.375 inch. Material - card stock. Double sided colors. Acid-free Double sided for multiple use Assorted bright colors Made in USA MODEL NO - MOSQ