NAMTSO provides you with the premium glow in the dark rocks. It is our commitment to be the best providing indoor & outdoor yard backyard pathway park lawn garden fish tank aquarium services. Product Information: 400PCS Mixed Color glow stones/Pack, roughly 1*inch in diameter each. Materials: The glow in the dark stones are made of natural resin, the glow stones are artificial rocks, non-toxic, non- radioactive and odorless . HOW TO USE? 1. Irradiate glow in the dark pebbles by sunlight or artificial light for at least 1 hour. 2. Put them in the dark WITHOUT LIGHT, then they glow. 3. The rocks glow will glow automatically in the dark environment brightly. Wide Range Use:The luminous stones can be used yard decor, backyard walkway, pathway or driveway, garden outside decor, lawn, fish tank, aquarium, swimming pool, pond, bar indoor & outdoor grave decoration with these glowing rocks. Glow in the dark gravel can be used for art & crafting, DIY gift decorations.