Aquascape Keyed Basalt Columns Set of 3 allows you to incorporate the sights and sounds of water into any environment, creating a beautiful water feature wherever they are installed. The set includes stones of three varying heights at 6", 12", and 18" high. When installed, the water will rise through the core in the largest column and spill into the next-smallest column. Aquascape keyed basalt columns are handcrafted and textured from natural stone. No two columns are alike, providing each stone with unique qualities. Aquascape Keyed Basalt Columns Set of 3 can be paired with the Aquascape AquaBasin® 30, kink-free tubing, and Ultra 400 Water Pump for a complete setup.