Camco Glow-on-the-Dock Pier Markers help to illuminate your dock, deck or wharf at night. These hexagon-shaped dock markers feature mounting holes, so you can easily install them wherever needed. These highly visible Camco Glow-on-the-Dock Pier Markers help you boat smarter for more fun on the water. 4-pack.Made in USA. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Battery Terminal.