Undercity Pledge Collection

An Undercity Pledge Collection is a package of five pledge gifts, and is the first hierarchical combining of the pledge items given out by various Undercity NPCs during the Love is in the Air seasonal event.

All of the Love is in the Air pledge gift packages are non-functional as regards their name and picture. You cannot read an Undercity Pledge Collection.

Source
If you have five or more  in your inventory, right clicking on any of them will consume five and create an Undercity Pledge Collection.

Ingredient
An Undercity Pledge Collection is one of three Undercity pledge gift packages which are the ingredients of the Undercity Gift Collection.