Rock Faces Learning Kit LK951 Modelers learn to make, install and color realistic rock formations. The kit contains illustrated instructions, a heavy-duty rubber rock mold and enough of the following products to finish four to five rocks: Lightweight HydrocalÂ®*, Plaster Cloth and Earth Colors™ Liquid Pigment. About Learning Kits Value-packed tools specifically developed to teach beginning modelers and other hobbyists how to use the Terrain and Landscape Systems. Learn to sculpt terrain, cast, color and install rocks, landscape various scenes, create paved areas, make trees, model water features and other scenic details. Reseal packages for easy storage.