Treasure Tubes - Set of 16Spark curiosity and sensory discovery with the Guidecraft Treasure Tubes Set of 16, a dynamic collection of stackable, see through tubes designed to support exploratory learning and open ended play. This expanded set invites children to investigate the properties of light, sound, and texture through hands on experimentation. Each tube features a transparent, round plastic centre and a removable lid, allowing children to easily fill them with marbles,