JellyBeadZ Brand 4 Ounce Water Bead Gel- Rainbow Mix JellyBeadZ are a number #1 seller on Amazon Non-fade, Non-Toxic, 100% Biodegradable, Non-Flammable. A great learning tool, kids are busy for hours, having fun experimenting, Many uses for decoration- weddings, showers, centerpieces Hydrate JellybeadZ for approx. 6- 8 hours. Each bead will expand to about the size of a small marble