TWEE Handmade Sidewalk Chalk Mason's Planets are out of this world! Mars, Venus, Earth, Mercury, Neptune and Pluto have two layers of color - an outer core and an inner core. Saturn, Jupiter, Uranus have three layers - an inner core, outer core and crust. Each retail order includes: A full solar system of nine TWEE Sidewalk Chalk planets. Each casepack includes: 6 units Dimensions: Large TWEE Planets - 2.5 inches in diameter Small TWEE Planets - 1.5 inches in diameter