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This Next Generation Asteroid Pack includes 15 sculpted and retopologized meshes. Polycount ranges between 900-1300 Vertices. Each asteroid comes with seven textures including:
• Ambient Occlusion
• Metallness for Unity 5 and Alloy
Note: If you are using Unity 4.x you will need to use a free version of a PBR Shader (there are various options on the Unity Asset Store) or use the wonderful "Alloy" shader solution also to be found here on the Asset Store. If you are using Unity 5 you can use the Standard Shader and drag/drop the textures into the right slots.