Details about JACK-IN-THE-BOX
Jack-in-the-box is a Uncommon Topper.
Toppers are on the roof of your Battle-Car and give your car your own style. These fashionable items can either be animated or static. You can equip them inside the customization window in the topper tab.
You can get common and uncommon items randomly after every online match.
You can search for trade offers with Jack-in-the-box here.