The glow stones are environmentally friendly way to light up or decorate! It is great use for decorating fish tank, aquarium, vase, waterscape, landscape, garden walkway, yard grass, planter, and some DIY home decoration. Features: Applications: fish tank, vase, flower pot, swimming pool and where ever you want. The stones are all unique and they can be used in different ways according to your imagination. Glow in the dark after full sun exposure, can lasts approximately 5 to 8 hours. The glow stones are made of resin, non-toxic, non-radioactive material. It can last up to 15 years, not only save energy but also protect our environment. Several colors for your option, you can send it as a gift to your families, friends. Specifications: Material: resin Colors: multi-color Pattern: 6 patterns (random delivery) Qty: 500 stones per bag Single stone size: 25~35mm / 0.98~1.38in Package size: 350 * 300 * 50mm / 13.78 * 11.81 * 1.97in Package weight: 1120g / 2.47lb Notes: The stone cannot glow itself, it will absorb the sunlight at outdoor, and glow at night. Or it can also absorb lamp light, and glow if you put it inside home. There are 6 patterns together, but they are delivered at random. Package list: 1 * Bag of Glow Stones