DEESEE(TM) 50 Pcs Glow In The Dark Stones Pebbles Rock For FISH TANK AQUARIUM Garden (Yellow) Material:Plastic Plastic material, durable, nature, safe and eco-friendly. Create a natural living environment for fish. Color:Purple,Yellow,Green,Red,Orange,Blue The size of 1 pc Pebble:1.7cm x 2.4cm/0.67'' x 0.94''(approx)