This is a promotional item for War of the Ring: Lords of Middle-earth.
It contains a Treebeard miniature + card and was available at Essen 2012.
If Gandalf the White is in play and a Companion is in Fangorn, you may use a Muster Action Die result to play Treebeard in Fangorn.
Game contains 1 card sized 66x120mm
Although size indication between Mayday Games and Ares Games is different, they are actually the same (Ares Games deck protectors are manufactured by Mayday Games). You will probably have a sleeve left from War of the Ring (second edition) or War of the Ring: Lords of Middle-earth .