Eagle 4″ Smooth Bumper Post Sleeves make old bollard posts look like new with no need to paint and scrape. The yellow high density polyethylene (HDPE) construction with UV inhibitors that resist fading, rusting or cracking. Eliminates annual maintenance while helping to protect vehicles and the post from impact damage. Have an easy slide-on installation. Sleeves can be trimmed for an exact fit and are available to fit 4″, 6″ and 8″ NPT pipe sizes.