Features: Warm tip,put the dices in the-sun, and you will get a good luminous-effect,similarly, the dices in the dark can also get the noctilucent effect; the luminous-effect depends-on the brightness of the environment; the darker the environment is, the better the luminous-effect. Safe material,the glowing dices set is made of acrylic and phosphor, non-toxic and tasteless, so will not cause any harm to the human body. Permanent luminous-performance,the 6 sided dices enjoy a continuous luminous-power; in general, if the dices fully absorb the light-energy, which can keep glowing in the dark for 2-3-hours; when the energy runs out, they can shine again by repeating the absorption of the energy. Wide occasion,the dark dices can be applied in a wide range from casino, party games, or just as table decorations the decorations of black-dot it possible to bring you many option in party themes idea. Attractive appearance,there are 10piece of luminous-dices with nice-look, feel and rolling performance. Specifications: Material:Acrylic Size:14mm/16mm Note: Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 10Piece Glowing Dices