Flowing Base Traffic Cone is made up of Fluorescence Orange PVC Cone Body and Recycle PVC Black Base Inside. The two parts interlock as a single inseparable piece, and would not separate even Heavy truck run over them. Also, High-density base creates low center of gravity for maximum stability. Flowing Cover Base Flowing Locking Design for Hiding the base INSIDE Fluorescence Orange with 2 years warranty. The Same Outline As Solid Orange Cone Meet American MUTCD standard.