Go on a journey of discovery and find items to fill these 4 reusable sensory tubes. Fill them with items you find in nature, small toys from around your home or classroom, or make your own musical instrument shaker. The creative learning fun is endless! This set includes 4 durable, clear sensory tubes, 8 solid, and 4 vented lids that fit securely and easily twist on and off. The tubes also stand upright so you can display your collections and projects.