These rock molds do a very nice job of creating rock formations.I am including pics of the actual castings after removal, so you can see what shapes they form.

please note that the actual size of the rock outcropping is not the same as the mold size, to avoid confusion.

Heres the larger casting. Just make sure to spray your mold with water, and a touch of dishwasher soap,and mix your plaster 1 part water, to two parts plaster.Always add plaster to the water.

these are ready for pigments and detailing,Have fun!