Sensory Tubes - Set of 4Designed to stimulate sensory learning and scientific discovery, this set of Sensory Tubes offers a safe, flexible, and engaging way for young children to explore the world around them. The freestanding, clear tubes are perfect for a range of experiments and tactile experiences, from observing the movement of liquids to listening to enclosed items rattle. Each tube includes secure twist lids some vented and some solid allowing for both smell based and