BACK TO SCHOOL CHALK DOODLES Handdrawn clip art + 3 CHALKBOARD DIGITAL PAPER Backgrounds. This set includes 101 PNG files, high resolution, 300 dpi, in white chalk style on transparent background, and 3 background papers, high resolution, 300 dpi, 12x12 inches, Graphics include speech and thought bubbles, arrows, badges, interrogative and exclamatory signs, ABC letters, 123 numbers, planets, moon, sun, clouds, rain, snow, glasses, light bulbs, check marks, crosses, math signs, geometric shapes,