The drinks are bottled by the Coca-Cola Company and made to Dunkin' Donuts' specifications (rival Starbucks' bottled Frappuccino line is bottled by PepsiCo) with Arabica coffee beans, milk, and sugar.
There are four flavors to the Iced Coffee line: Original, Mocha, Espresso, and French Vanilla.
Photo via Dunkin' Donuts.