Learning Resources Primary Science Sensory Tubes. These giant clear tubes develop sensory awareness and encourage scientific exploration through a variety of uses. Freestanding plastic tubes open at both ends with securely fitting lids to hold a variety of liquids and solids. Kit includes eight solid lids and four vented lids. The vented lids are ideal for exploring early explorer’s sense of smell or for holding small creatures for observation. Tubes measure 30cm L . Suitable for ages 2+