Caverns of Blood is a modular dungeon system made from recycled tires. It uses a modular tile system based on a 1" grid floors making it especially easy to use with popular RPG game systems.The sets come unfinished in black primer. They take paint easily;the ones in the pictures were painted with simple house paint.Recycled tire rubber comes to our manufacture ground up and then is pressed together with a binder creating detailed durable castings.There are fifteen SKU's available. Individual tiles are priced starting as low as $4. Save over 30% on the tile price with Caverns of Blood sets.