The rarity of The Ol' Chopper's Set is Rare, and been equipped it takes a “Bundle” slot. At this moment the item is available for trade.
The Ol' Chopper's Set is a skin for Pudge. The skin was added to the game on August 16, 2013, it was created by Jeremy Klein.
The Ol' Chopper's Set has been recently added to the game, which makes it rather popular with the game community.