EmbTao Glow In Dark Vegvisir Viking Compass Norse Rune Morale Tactical Embroidered Applique Iron On/Sew On Patch Glows in the Dark after absorbing the light. Very Cool! EmbTao is the first brand of developing Embroidered Glow In Dark Patch. Measures 3.3 inches wide by 3.3 inches tall. Heat seal backing. Iron on or Sew to any garment. Ironed-on patches will not come off. Safe & non-toxic. Washable and Durability. Viking magical symbol intended to help the bearer find the way through rough weather. Just like our life.