BakuCrystal Bakugan are clear to seem similar to a crystal. Their color is clear with painted non-translucent accent. The accent color could be any color because the BakuCrystal Bakugan contain no attribute and are referred to as clear.
BakuCrystal also known as Clear, are according to the rule book. They must take the attribute of an opposing Bakugan you are fighting with or the highlighted attribute.
Bakugan series (Bakugan Battle Brawlers: New Vestroia)