36 Glow In The Dark Mardi Gras Beads Party Favors Necklaces (3 Dozen) Package contains 8 different colors. Hard Plastic necklaces. Emits a faint glow after exposure to sunlight for a least an hour, not a bright light. Some light source necessary for continued glow. Effect wears off quickly without enough light. Not for blacklight. Not a gel or battery operated item.