These glow in the dark rocks can be used to decorate your garden, fish tanks and ponds. Also, it is perfect gift for all festivals like Halloween Christmas Mother¡¯s Day Father¡¯s Day ...<p> <p> Specifications<p> <p> Color : as you can choose <p> Quantity: as you can choose<p> Material: Polystyrene (PS)<p> Diameter: 0.6"-1.2"<p> <p> Note: <p> <p> Please expose the garden rocks under sunlight at least 4 hours at first use.<p> <p> These glow rocks are expected to have a life expectancy of up to 15 years. Please radiate them with light again if they are not bright enough.<p> <p> Spread these glowing stones in your garden and let the sun shine them, Normally they can glow in dark environment for up to 2-3hrs after a full day in the sun or other light sources .<p> <p> These glowing pebbles ranges 0.8-1.2 inch, small enough to present a potential choking hazard for younger children, Please make sure an adult is present if kids want to play with these glowing stones <p> <p> Warm Tips - For better glowing effect, do not stack stones on top of each other. More stones leads to more brightness and more possibilities. So use more to decorate your garden.