The black pad is the finessing pad of the 3.5in CCS set, a charcoal black foam with the CCS dimples pressed into its face. The picture shows the face of one pad and the black backing of another. Also in this size: blue finishing and green polishing and finishing.
At 3.5 inches this is a spot pad: a flat, full contact foam pad small enough to work on one blemish without touching the good paint around it. Lake Country lists it for a rotary polisher, a dual action polisher or an electric drill.
CCS stands for Collapsed Cell Structure. The dimples on the face are pockets where the foam cells have been closed, so polish is not soaked up there. More of it stays on the surface of the pad and on the paint, which gives the polish a longer working time.
More in Finishing Foam Pads and from Lake Country.