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1kg bag of our SKYBLUE glow rocks. Just a few minutes of sunshine to fully charge them or up to 10 minutes from a artificial light. They glow in the dark each night and the strength of charge reduces overnight as the energy is released from the stones produce an opal effect. And a lovely atmospheric to any dark night. The SKYBLUE rocks are made from Polyurethane and universal glow in the dark pigment. The modern glow pigment is spread evenly through the stone so you can cut a stone in half and the 2 halves glow equally as well as the original stone. The stones are very hard CAUTION: Please do not swallow Product: Aquatic Sky High Quality BioLuminate pigment Polyurethane stones. Available at: vendorsense.com