FenceEasy Fence Cap Post Toppers (2 Sizes Available) - Indoor Outdoors
4x4 Fence Post Cap (3 1/2") Single Pack Decorative Unfinished Aluminum - Mailbox, Lamp Post, Wood Deck, Dock, Piling Caps for Wooden Posts by WeatherPRO Post Caps : Amazon.co.uk: DIY & Tools
Metal DuraPost is strong but lightweight - Crestala Fencing Centre