A basic set of materials/surfaces comes with the Archicad installation.
If you have a Select Service Agreement with Graphisoft then you will have access to a larger set of surfaces through BIM Components.
Otherwise you can only download what has been placed on BIM Components one surface at a time.
Otherwise other people selling templates may have sets of surfaces available for purchase with their templates.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11