GLOW IN THE DARK ASHTRAYSHOULD ABSORB LIGHT BEFORE USING. You can put it under sunshine or lamp, the light absorb more, glow time will be longer. This outdoor ashtray for with noctilucent design for smoking in the night, looks very decorative during night, great choice for indoor also outside MATERIALThis luminous garden ashtray use Eco-Friendly Material Silicone which is more healthy, easy to clean, also can be folded HEAT RESISTANTThe silicone outside ashtray is High Temperature Heat Resistant, you can directly put a cigarette out, will keeps the smell down, not like the other plastic ashtray bubbles up and turns white and black. Avoid continuous contact between the bottom and unextinguished cigarette butts, otherwise it may be burned through APPLICATIONPerfect for Indoor and Outdoor Use, like garden, patio, porch, home, office, restaurants, hotels, and bars. If you want it to stay clean, you need to wash it often instead of once for a long time DIMENSION8.3cm x 2.3cm / 3.27inch x 0.91inch(D x H), which seems cute, pack of 3 grey home ash traysfor smokers. It's also a great smokers gifts for festivals like Christmas and Thanksgiving