These Bumper Post sleeves make old bollard posts look like new! High-visibility yellow HDPE construction with UV inhibitors resist fading, rusting or cracking. Eliminates annual maintenance while helping to protect vehicles and the post from impact damage. Unique vertical ribs provide extra impact protection while allowing for easy slide-on installation. Can be trimmed for an exact fit. Poly base available for 6" post sleeves to convert into poly bollard.