The Item Unlock Pack is a purchase from the Guild Wars In-Game Store that allows access in PvP to the item upgrade components from each of the three campaigns.
Access to 319 item upgrade components (Runes, Insignias, Inscriptions, and more) for use in PvP.
The kit costs 9.99 USD / 8.99 EUR / 5.99 GBP from the in-game store.