M Design Art Handcraft Medium Sapphire Jellyfish Art Handcraft Sculpture [Jewelry] This is a Red Devil Medusa Small Jellyfish. This Jellyfish will glow in the dark for as long as you on it. The jellyfish is made of epoxy and will never break or crack. The jellyfish glows a really nice teal glow at night. 4 inches tall and glows in the dark.