Hi! This is a library of materials, metals. The archive scene with balls, each the name, the Related name of the chemical element. Also in the archive a separate preview for each metal. Materials suitable for users VRay SP1, SP2, where there BRDF Microfset GTR (GGX). For users of versions older will need to see BRDF select Blinn, or Phong, or Ward ? that you prefer. In the viewport materials look black. The color and shade is made of metal with a card Falloff, curves RGB, under Output. The archive file only