Thea Render for SketchUp --- Material 2 / Material Presets --- Tutorial #14
There are also some presets coming with Thea for SketchUp. They helps you to modify material specifications easily.
These presets are; Matte, Plastic, Thin Translucent, Lacquer, Ceramic, Car Paint, Colored Metal, Mirror, Thin Glass, Thick Glass, Emitter and Thea Material.