Red is the last pad in the 5.5in Force set. In the picture one bright red pad stands face on and another shows its black backing, both with the centre hole. It follows the black finishing pad.
The red foam is a soft one, meant for the final coat of wax or sealant. Lake Country says it works especially well with liquid waxes and sealants, because the foam is firm enough to leave most of the product on the paint instead of soaking it up.
Force pads are Lake Country's dense hybrid foam pads. They are 1.25 inches thick with a tapered edge, and the maker designed them with forced rotation polishers in mind, where it found thicker pads easier to use. The backing is 5 inch, so the pad suits a 5 inch backing plate, and Lake Country says a 4 inch plate works too.
After use, wash the pad with a pad cleaner, lay it flat to dry with the backing facing up, and store it dry in a sealed bag or box.
More in Finishing Foam Pads and from Lake Country.