Water Polymer Crystals are non-toxic hydrogel crystals are ideal for your farming, gardening, humidor, science project, arts and crafts, insect hydration and much more. Made in the USA. Size Recommendations: Small: Transplanting plants and trees as a root dip. Fantastic fake snow effect as an arts and crafts project. Spill cleanup. Medium: Feeder Insect Hydration. Humidor humidifier, especially when mixed with 50/50 Propylene Glycol and Distilled Water, otherwise known as Special Solution. General lawn and garden use as a drought preventative. Arts and Crafts use such as the popular cool tie or neck cooling bandanna. Large: Feeder Insect Hydration. General lawn and garden use as a drought preventative. Arts and Crafts use as fake ice or broken glass centerpiece.