Deckorators 5.5 in x 2.5 in Contemporary grab and go Brown Composite Angle Adapter (2 Pack) Corner Posts using the adjustable and self closing using the adjustable and self closing hinges for precise alignment textured wood grain finish Made of high grade MDF with durable laminate Supports up to 250 pounds for strong design Adjustable shelving on both sides makes it easy to fit your media Cord management features are in back to organize wires of electronics Ships ready to assemble with step by step instructions which provide strength and resistance to weathering while keeping maintenance needs low Q: What materials are these adapters made from