These high visibility cones have a 4" and/or 6" reflective collars made from tough, durable, and flexible UV stabilized polyester sheeting. Three times brighter than previous cone collars and complies with FHA requirements. The cone is injection molded so cones won't stick together when stacked! Its patented interlocking design secures the fluorescent portion of the cone to its recycled black base. Cone is brilliant fluorescent lime 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.