Help identifying piece - wheels on arched base I'm not familiar with this piece that showed up in an old bin of Legos from a second hand store. 

The text of the copyright reads "2008 the LEGO group" 

Is there anyone that can tell me a part number or set this might have come from?
this is: Part # 48394base

Bricklink:

Sports Promo Skateboard Base with Four Wheels from McDonald's Sports Set Number 7, Set 7921

Brickset

Set 7921-1: Skateboarder, Grey Vest