Sponge Rock - Large Boulder From Magic By Gosh
These highly compressible, sponge boulders are funny, oversized props that look like they're really heavy, substantive creations of mother nature. But they're hand crafted from foam rubber.  Each sponge boulder is hand crafted.  The boulder may appear like coal or a black rock with white specs.  The boulder is about 8 inches across at it's longest point.  Its about 19 inches in circumference at the longest point.  About 12 inches in circumference at the middle of the side of the boulder.