It's like having two products in one: the day colors you need and a glow of the same color as the lighting changes or when the water darkens. Each color provides over 10 times the brightness and eight times the duration of conventional glow colorants. Can be recharged with natural sunlight or halogen lamps. Choose from various sizes to target everything from panfish to lake trout. Sizes: 3-1/2" (Per 5), 5" (Per 4). Color:(007)Natural/Green Glow.