B1A4 Official Light Stick Show your love for B1A4 with this unique light stick. The official B1A4 design is a green skull with hearts for eyes and an adorable bow tie. By pressing the red button, you can choose between on, off, or flare (flashing) modes. - Official WM Entertainment product. - Light stick is 22 cm / 8.7 inches long and measures 10 cm / 3.9 inches at the widest point.