Full Idea
Tropes are supposed to be particularized properties: nonspatiotemporal parts of their instances which cannot occur repeatedly, but can be exact duplicates.
Gist of Idea
Tropes are particular properties, which cannot recur, but can be exact duplicates
Source
David Lewis (Against Structural Universals [1986], 'Intro')
Book Reference
Lewis,David: 'Papers in Metaphysics and Epistemology' [CUP 1999], p.79
A Reaction
Russell's objection is that 'duplication' appears to be a non-trope universal. The account seems wrong for very close resemblance, which is accepted by everyone as being the same (e.g. in colour, for football shirts).