Jumbo Coloring without the Jumbo Mess! Contains 15 pages of Thomas and friends themed Color Wonder line art. Large Thomas character line art is easy for young children to color in using Color Wonder markers with invisible ink that appears only on Color Wonder paper and not on skin, furniture or fabric. Crayola Color Wonder Poster Pages Mess Free Coloring, Thomas & Friends Featuring 15 poster-sized coloring pages, Crayola Color Wonder Poster Pages Thomas & Friends gives kids the freedom to color their favorite characters without making a mess. These jumbo prints work with Color Wonder markers (sold separately) so kids can color in Thomas and his friends without getting marks on furniture, walls, or clothing.