Each precast plaster and hand-painted rock is unique. Rock Face Ready Rocks are cast to nest side-by-side and top-to-bottom. Use separately or to create a large wall. Four rocks measuring 7 - 7 1/4 (17.7 cm - 18.4 cm) l x 3 - 3 5/8 (7.62 - 9.2 cm) h Model any rock from anywhere. Cast or carve your own; install ready-to-go hand-painted rock; and pile debris under rock faces and along road cuts.