from Invisible Structures
is a porous paving system that holds gravel in place without sacrificing drainage. Shown here at the Pentagon Memorial, the system keeps the gravel in place and is stable enough for rolling a wheelchair or driving a truck on top. Available in black, tan, gray, and terra cotta.
3'-4" x 3'-4" or 1'-7 4/5" x 1'-7 4/5" units