Chunky, durable test tubes put serious science safely within reach for young students! Encourages inquiry-based investigation and hands-on observation Supports serious science experiments - plastic tubes are safe at temperatures from 10deg -200deg F and feature calibration marks (25, 50, 75 and 100 ml) Includes 6 test tubes, different colored lids (to track experiments), sturdy rack and Activity Guide Hand wash Tubes measure 6'H x 1.5' in diameter **Age 3+ **Grade PreK+