This Blackest Night 4 Ultraviolet Spectrum Button Set contains 4, 1.25 inch diameter buttons representing the 'positive' side of the emotional spectrum - the ultraviolet! You really can't go wrong when wielding the Green Light of Will, the Blue Light of Hope, the Indigo Light of Compassion, or the Violet Light of Love! You can make Hal Jordan, Saint Walker, Carol Ferris, or Indigo-1 proud...you just have to make a choice and don the symbol of their respective corps! Suppose you could use these exceptional buttons as a sort of mood ring like effect, but hey, you can do whatever you want!