Physically, the photoluminescent tumbled gravel is hard, with rounded edges. It is neither toxic nor radioactive, and does not shrink or contract under external influence. Its luminosity duration is rated at over 15 hours, with a luminosity life time of over 20 years.The material is a artificial decorative gravels that looks like a river rock. It can be applied loose on top of surfaces such as grass, gravel, earth and so on. It is primarily suitable for use as a landscape installation.
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