Black Sea Nettles is the world's largest jellyfish. This monster can grow up to 60 ft, twice the size of a Great White Shark. A glow protein that has helped protect jellyfish for millions of years. Did I mention, They are shark eaters. The tentacles have powerful toxins that immobilize the prey long enough for them to swallow it. They come with a commitment to always glow in the dark, allowing them to glow for many years to come. Don't hesitate to go for it!