Attwood Marine - Anchor Buoy - 9" Diameter - 9350-4. Attwood's Anchor Buoy is constructed using premium marine-grade vinyl construction for superior durability. The buoys are soft and pliable to prevent scratching and have built-in UV inhibitors to guard against discoloration of the high-visibility fluorescent orange. These buoys use "MicroGuard" technology to protect from rotting, mold and mildew.. Features:. Premium marine-grade vinyl. UV protection. Size - 9" Diameter. Fluorescent orange color