Wheel, originally from the Destruction Micron group, the Under Groove version was limited to Ito Yokado stores in Japan. He was originally only available with the purchase of Micron Densetsu Convoy Super Mode aka "Super Pants Prime" as many called him in Armada. I don't know what the original print run was for this toy, but the Under Groove editions aren't that easy to come across today on the secondary market. In fact, I was never able to acquire the other two.
Not one of my favorite Micron molds, but at I like the Under Groove color scheme. The "Energon" blue looks great mixed in with the darker colors. I can only recommend this toy to the Micron completions. If you are a casual fan then you'll want to stay away from the Under Groove Microns for the price they'll command alone and just stick with the Destruction Microns.