Designed by Cathy Goodale for use with the 9x12 Guerrilla Box. Can be attached to the sliding palette or used separately. Features 20 slanted color wells in three sizes and two mixing areas (plus the inside of the lid). Special spill resistant design is also easy to clean. A great compact watercolor palette -- very high quality! Extra durable, double thick, high-impact styrene. 9 x 12 x .56 inches.