These are Spiral Groove’s most adaptable Strange Attractors, which is why they are called the Universal version. Unlike the other versions where they have a threaded stud that screws on to the components, the Universal Version just slots under the component. There is a “dimple” on the red aluminum side where components that have spikes will have their spike tip sit in there. The graphite side is the side that sits on to the shelf.
Cosmetically, the set looks good. They were previous DEMO sets that were lightly used. Original box included.