This spiral liquid tube is a colourful sensory tube. Comes in 3 vibrant colours (pink, blue or green). Turn them upside down and watch as the liquid bubbles spiral down the staircase to the bottom of the tube. Takes approximately 5minutes to run through, though we timed one of ours and it took 9minutes from start to the very last drop. The action of the bubbles can stimulate visual learning with regards to colours and passing of time, however we recommend these primarily as a visual sensory calming tool. A great addition to the sensory box, school or home. Encased in plastic and approx 14cm long.