2 Pack:glow-in-the-dark; Clear- Amazing Cosmo Beads(tm) Water Marbles ;Great for Gift Giving As Stocking Stuffers 2 Pack: Glow-In-The-Dark water marble pearls COSMO BEADS! and the beads GROW too. about (1,100 beads);10g./pack.Fancy Package great for gift. Glow-In-The-Dark COSMO BEADS! A novelty item for kids of all ages. Simple directions make them ideal for anyone to use; the young/elderly. Yup, they glow in the dark by placing them under direct sunlight or light source in the room for 5-7 hours before or after hydration. The longer exposed to light the longer they'll glow. MULTIPURPOSE: Toy-games Hours of educational fun for kids. Deco Centerpiece, Gift; Reusable up to 2 years, Non-fade, Non-Toxic, 100% Biodegradable, Non-Flammable.