100Pcs Glow In The Dark Pebbles Stones Luminous Aquarium Garden Fish Tank Decor. Specifications: Line a walkway, edge a flower bed, fill a planter and decorate fish tank with these unique stones. After being exposed to daylight, these pebbles glow in the dark. Glow lasts approximately two to three hours after full sun exposure. Type: Luminous Stones Material: Photoluminescent Pigment + Resin Quantity: 100 Pcs/Pack Size: 2cm - 3cm/0.79" - 1.18" (Approx. ) Notes: 100 pcs same colors stones in one pack, the spape of stones is randomly sent. Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 Pack of Luminous Stones (100 Pcs) 1 x User Manual