Hummer H2 Roof Rack Letters Official Licensed Product: General Motors Corporation These chrome .020" letter inserts are made of an extremely durable chrome material called Ultra-Chrome, it can endures the harshest environments and is UV Stable. Since this product isnt ridged like Stainless Steel or Aluminum it will resist dents, dings, and creasing. Laser cut here in the United States, with American made materials. Simple to install - just clean, peel the 3M adhesive and press into place.