4Pcs Fence Post Cap 5.9" x 5.9" Square (Wood Plastic Composites) Wood Grain Vintage Color for Outdoor, Stairs, Deck, Mailbox1. The post cap is made of wood plastic composite material (made of wood and plastic), which is a brand new environmental defense materials with higher performance than plastic.2. Not clean to fade, waterproof, fireproof, hot temperature resistance, put on resistance; good adsorption of paint, DIY color; non-toxic, non-pollution.3. Compatible with 5.9" x 5.9" (150mm x 150mm) sq. posts; please notice that wood-plastic composite materials will cause choppy color, but long provider life.4. Used for outdoor, stairs, decks, mailboxes, docks, gardens, fences, homes, etc.5. 4pcs x submit cap.