Develop their senses and encourage science exploration with this set of 4 sturdy, clear tubes. The tubes feature dual openings and 2 solid lids for each. The vented lids let children explore their sense of smell or secure small creatures for observation. These lids easily twist off and on, and hold liquid securely inside. Details: 12" x 2.5" in diameter each 4 clear tubes Dual openings and 2 solid lids for each For ages 2 and up