The Diamond Fishing PVC Foam Marker Buoy is a must-have in any angler's arsenal! Use it as a visual waypoint to help you maintain your position or to mark deep structure. Hardened PVC-foam construction resists weather, sunlight, oil, gasoline, saltwater, abrasions, and other hazards on commercial fishing vessels, so you can be sure it's built to last. Hardened PVC-foam construction Resists weather, sunlight, oil, gasoline, saltwater, abrasions, and other hazards on commercial fishing vessels Easy to use