Flash Balloon

 is a rare base item.

Obtained from

 * Metal Part I: Loot Cache
 * Metal Part I: Large Loot Cache
 * Metal Part I: Large Treasure Box
 * Metal Part I: Small Treasure Box
 * Metal Part I: Treasure Box
 * Metal Part I Base Item Box
 * Metal Part I Large Base Item Box

Feats

 * Bedlam, Battle and Beyond: Collect 1 Base Item from Metal Part I (10 points)
 * The Batman who Decorates: Collect 10 Base Items from Metal Part I (25 points)
 * Metal Goes With Everything: Collect 30 Base Items from Metal Part I (50 points)