Find trinkets, natural materials and sensory objects to collect. The round, colorful, transparent 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. Largest tube measures 9 cm long.