Get a jumpstart on your next science experiment with Test Tubes, Rack + More. A great basic kit, featuring some of the most common tools found in all labs. The plastic test tubes are made from polystyrene, resist breakage and are safe for all ages. The 4-way test tube rack is sturdy and can be used for other size test tubes, even the large Safety Test Tubes or “preforms”. Having the right tools is sure to make your experiment easier and safer.