12 inch half sphere ball concrete or plaster plastic craft mold. Our Craft mold makes a half sphere that measures 12 inches diameter. Pour the mold twice and fit together to form a full round ball. All of our molds can be used with concrete, cement, plaster, soap and resin. Comes with basic instructions for creating your pieces. Our molds are made of several different blends of polyethylene plastic which allows you to use the molds over and over. Our plastic is somewhat flexible so it allows for your finished pieces to be removed from the molds easily. This is a mold to pour into to make your own stones.