Develop their senses and encourage science exploration with this set of 4 sturdy, clear tubes. Tubes feature dual openings and 2 solid lids for each. Four vented lids let children explore their sense of smell or secure small creatures for observation. Lids easily twist off and on, and solid lids hold liquid securely inside. Tubes measure 12"H x 2.5" in diameter. Ages 2 and up.