Roto - 100pcs of Decorative Gravel for Your Fantastic Garden or Yard Glow in the Dark Pebbles Stones for Walkway Blue Type: Garden Supplies &gt; Garden Ornaments Colour: SkyBlue in the dark; White in the daylight Material: Photoluminescent pigment + resin Size (Approx): 2 x 2.9 cm Quantity: 1 set