The locals call this foul network the ratfang sewer gale force nines official dungeons dragons game mats are high quality single sided vinyl surfaces that are ideal battle grids for staging encounters during your adventures the mats lie flat for ease of play and are sold in a sturdy polycarbonate tube for easy storage and transport the mats may be marked with wet erase markers to temporarily alter terrain areas or make other notes about battlefield conditions during play the game mats mea