Reflective Dome Top Bollard Covers for 4" Diameter Pipe (65" Height)Reflective Dome Top Bollard Covers The Reflective Bollard Cover is a dome top bollard cover with two grooves toward the top of the sleeve to allow the reflective tape to lay flush against the plastic, improving the look of the bollard while reducing the chances of the tape peeling. The Reflective Bollard Covers can fit 4" to 4 1 2" pipe and are available in both 1 4" or 1 8" wall thickness. Reflective Bollard Cover colors include Yellow, Black and Red