Burrows - Tunnel Pack is part of the Dungeon of Doom series. It is made of "Dwarvenite" and includes some metal and magnetized parts. The Floor Trap – Spikes is made with Dwarvenite G. This item was initially available as an add-on pack during the Dungeon of Doom Kickstarter. The item comes in both painted and unpainted versions. Burrows - Tunnel Pack comes with these 23 pieces: (3) Long Straight Tunnel (4) Short Straight Tunnel (1) T-Intersection Tunnel (3) Tight Turn Tunnel (1) Wide Turn Tunnel (3) End Cap (1) Deadend End Chamber (4) Dirt Floor Insert (1) Web Floor Insert (1) Spikes Floor Insert (1) Surface transition hole