The River Rock Faux Rock set consists of a set of high-density polyurethane foam "rocks' that have been removed from the larger panel. They are now loose and hollow with a flat back. Because they are high-density polyurethane, they are easy to cut/trim with a wood-cutting saw. Typically the River Rock Faux Rock Set is used in conjunction with the
River Rock Grouted Filler Panel to complete a run.