Designed to serve as a visual and audible warning to personnel. Unique spring-loaded design will bend and not break like rigid bollards. Prevents damage to bollard and equipment. Promotes long life. Order bollard with or without light/siren option. Light/siren option includes sensitive switches that will activate a strobe light and warning siren when contacted. Operates with two 9V batteries (not included). Simply slides into open top of bollard. Each bollard is manufactured from steel and includes a powder coat safety yellow finish. Bollards measure 42 inches high with a 2-1/8 inches O.D.