Only the most courageous troops dare navigate the twisted ruins of metropolitan devastation created with the Urban Rubble Basing Kit. This kit contains Fine Grit, Medium Grit, Rocky Grit and Concrete Rubble Mix which combine to create a crumbling cityscape to base your models. Only the most courageous troops dare navigate the twisted ruins of metropolitan devastation created with the Urban Rubble Basing Kit. This kit contains Fine Grit, Medium Grit, Rocky Grit and Concrete Rubble Mix which combine to create a crumbling cityscape to base your models. Only the most courageous troops dare navigate the twisted ruins of a metropolitan.