Full Idea
Properties are central to the universe's causal order in a way that sets could not possibly be.
Gist of Idea
Properties have causal roles which sets can't possibly have
Source
John Heil (The Universe as We Find It [2012], 02.3)
Book Reference
Heil,John: 'The Universe as We Find It' [OUP 2012], p.18
A Reaction
The idea that properties actually are sets is just ridiculous. It may be that you can treat them as sets and get by quite well. The sets can be subsumed into descriptions of causal processes (or something).