Ready-Made Woodland Scenics Rock Molds are durable, flexible and well detailed. The 15 selections offer value and versatility not available anywhere else. Cast small molds, rock outcroppings, top rocks, or entire rock faces. Lightweight hydrocal castings release easily and completely. UltraCal 30 Hydrocal is recommended; however, Plaster of Paris may be substituted. Measures approximately 2-1/2" wide on the left side, 2-3/4" wide on the right side and it appears to be 3-1/2" wide in the middle. WD1244 measures 9-1/2" long. Various depths from ½" to 1½". This rubber mold can be used as one solid rock or can be broken into many smaller pieces once cast.
See also Dave Frary Video "Rocks & Basic Scenery Made Easy" TM0111!