Archmaterials vol. 3 is a collection of 50 high quality assets for texturing, specially designed for architectural visualization purposes. Archmaterials collection is the effect of many working hours spent on scanning, optimizing and setting up PBR materials that will look great even on the most demanding close-up shots.
If you buy 8k + substance format, you will get textures and SBSAR files that allow you to achieve many unique variations by tweaking material's parameters. Each material is also set up already in MAX file for V-Ray rendering (3dsmax 2013, V-ray 3.6).