Injection molded cones don't stick together! patented interlocking design secures fluorescent portion of hazard cone to recycled black base. brilliant fluorescent lime cones with uv inhibitors to resist fading. superior flexibility in heat and cold - pvc is better than rubber traffic cones and pylons, since it can instantly bounce back from an impact. the recycled black base traffic cones look clean despite heavy use, being run over, and tar stains.