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http://www.inter-lux.com/wp-content/uploads/2011/11/TZ-60.pdf
This is a really clean look. I don't usually recommend seamless-type fixtures as the mudding outward from the ring tends to crack over time and/or the contractor will have a tough time feathering out the plaster to make a smooth transition to the ceiling. These, however, are made of plaster with the fixture to be recessed at equal depth with the ceiling and only needing a bead of plaster to make the transition. Neat concept. Let me know if you would like to see an example of this.