Treasure tubes feature transparent windows are perfect for observing or displaying small objects. What makes a fun noise when you shake it? Find trinkets, natural materials, and sensory objects to collect in the beautiful, stackable Treasure Tubes. The round, transparent acrylic tubes with removable covers hold small objects to observe, display or rattle. Ideal for colour and sound exploration and light table activities. Holds marbles, beads, twigs, leaves, small toys and more. Stack the tubes on top of each other to customize play experience. Easy-to-remove wooden top keep objects securely in place until ready to be replaced. Use for colour and sound exploration and light table activities.