MADE OF CEDAR - This copper top 4 x 4 fence post cap is made out of strong and sturdy Western Red Cedar wood for durability and longevity. For indoor or outdoor use. COPPER PYRAMID - Woodway’s copper pyramid post cap is made from a solid sheet of copper to prevent seams that can allow moisture to seep through. WEATHER RESISTANT - Weather resistant, quality construction that is designed to handle the outdoor elements. Cedar is naturally decay resistant. PROTECTS POSTS - This copper post cap prevents water from settling in your posts which can cause rotting. Made with quality it will not fade or split at the corners. EASY TO INSTALL - Easy to install, this nominal 4 x 4 copper post cap fits posts up to 3.5 x 3.5 inches and is made with rabbeted block for a secure fit. Post cap is secured with adhesive sold separately.