Item Type: Aquarium Stone_x000D_ Material: Plastic Resin_x000D_ Weight: Approx. 403g / 14.2oz_x000D_ Size: Approx. 25mm / 1.0in_x000D_ Product Use: Vase, fish tank, swimming pool decoration, etc._x000D_ Instructions for Use: The stone can only emit light after absorbing the light source. It can also emit light while absorbing light. It can repeatedly absorb light and emit light repeatedly 1These stones are using high?quality plastic resin materials, non?toxic and non?radioactive, can be used safely. 2There are many colors, beautiful and exquisite, can be used for any decoration or scene. 3Suitable for vases, fish tanks, aquarium, gardening, swimming pool decoration, villa gardening, etc. 4Fluorescent stone, which glowing at night, is very suitable for illuminating or decorating your fish tank. 5It can emit light after absorbing light source, and it also emits light while absorbing light, can repeatedly absorb and emit light.200 x Fluorescent Stone1. Please allow 0?1 inch error due to manual measurement. Thanks for your understanding._x000D_ 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.