User Summary: The Cavern Kickstarter Stretch Goals Set is made of "Dwarvenite" and and expands the Cavern Base Set. This set was only available with support of the Cavern Kickstarter. Set comes in both painted and unpainted version and matched the version of the backed Game Tiles set. The Spider Web is made of translucent white rubber. The Cavern Kickstarter Stretch Goals Set comes complete with these 28 pieces: (1) Archway (2 inch) (1) Chasm Ledge, Concave (1) Chasm Ledge, Convex (1) Chasm Ledge, Pointed (1) Chasm Ledge, Straight (2) Corner B (2) Corner C (2) Floor B (2) Floor C (1) Floor D (2) Passage (2) Passage, 45 Degree (1) Passage, End Cap (1) Spider Web (1) Stalagmite, Narrow (1) Wall, Free Standing Curved (1) Wall, Free Standing Straight (2) Wall, Straight B (2) Wall, Straight C (1) Wall, Straight, Mine Entrance