Royal Brush-Clamshell Art Sets: Watercolor Pencils. Essentials by Royal & Langnickel are the must have artist materials to begin exploring your artistic side! This 9x8-1/2x1/4 inch package contains eleven watercolor pencils, six watercolor paints, one paintbrush and one double barreled sharpener. Conforms to ASTM D4236. Imported.