Did you know that kidney bean roots grow twice as fast as the plant does? Neither did we until we started growing them in this unique demo tank. But watching roots grow is just the beginning. While this demo-tank was originally designed as a unique way to display flowers, (see photos) the number of uses for this tank might just be limited by your imagination. The inner flexible lining can take on just about any shape and it is water tight. Use it to grow and display pond life, grow flowers and vegetables, or conduct experiments. The sides are made of sturdy plexiglass and the tank disassembles for easy cleaning and for redesigning the inner seal. And our tanks are about half the price of similar quality tanks. The tank measures 12 X 12 X 1.75 inches (30 X 30 X 4.5 cm). Includes tank, flexible liner, and instructions.