Originally marketed as part of the "Promo Pack" for the 4th Edition's Kickstarter, the Promo Pack was split into 6 "Expansion Packs", which Game Salute has been slowly releasing to retail.
7 Salvage Cards (for use with Alien Frontiers: Outer Belt)
3 Alien Tech Cards (for use with Alien Frontiers)
1 Outer Belt Reference Card
1 Agenda Cards (for use with Alien Frontiers: Factions)