The glow stones are environmentally friendly way to light up or decorate It is great use for decorating yard, garden, fish tank, walkway, potting, aquarium & fish tank and more.   Features: Lighting a pathway, driveway, flower bed, fish tank aquarium, or garden, make the places special.  Glow in the dark after full sun exposure, can lasts approximately 5 to 8 hours.  The stones are all unique and they can be used in different ways according to your imagination.  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: Style: 12 styles (optional);  Qty: 50 stones per bag;  Single stone size: 20~30mm / 0.79~1.18in;  Package size: 200 * 150 * 20mm / 7.87 * 5.91 * 0.79in;  Package weight: 130g / 4.59oz;   Package list: 1 * Bag of Glow Stones