*Opaque blue base with swirls of yellow on the surface. Marble pictured is a stock photo of a Moon Marble Co. marble of this type. Marble received may vary slightly. Machine marbles vary one marble to the next, even in the same batch. Due to the machine process marble sizes and color will vary slightly. Warning!: Choking Hazard. This toy is a marble. Not recommended for children under 5 years. Large marbles can be hazardous to your toes when dropped. Due to the machine process, marbles of this size may have creases in the surface.