From publishers website: This awesome set contains many cool pieces that take your dungeon designs to a new level! Even though the pieces don't look all that sexy, they are HIGHLY useful in making cool new room shapes. No more boring standard-looking rooms! Now you can make 15 ft. wide openings -- or doors in the corners of rooms. The sky is the limit with this creative set. Note that the set also includes THREE 6-inch passages -- which making long hallways OR suspended hallways a snap.Contents: (4) Narrow Swinging Door (2) Narrow Dead End (3) 6' Long Passageway (2) Alcove (2) Extender-Half Floor (2) Extender-Half Short Passage (2) Extender-Half Wall (2) Half Corner-Left (2) Half Corner-Right (2) Half Wall-Right (2) Half Wall-Left (2) Wide Dead End (30) Bowtie ConnectorsNote there are two versions of this set released, the latter does not contain the bowtie connectors and corresponding indentations on the pieces, but is otherwise identical in contents. - BoardGameGeek