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 -10C to 100C and feature calibration marks (25,50,75 and 100ml). Includes 6 test tubes, different coloured lids (to track experiments0, sturdy rack and Activity Guide. Hand Wash. Dimensions of Tubes (cm): 15 (h) x 4 (dia)