Pack of five 10ml plastic test tubes. These screw-capped tubes are transparent so you can see exactly whats inside. Their flat bottom allows them to stand-up on flat surfaces without the need for a test tube rack. Fill them with different liquids, like oil, water, vinegar, glycerol and food dye, for identification through shaking and tipping. An essential teacher resource for any science classroom. (Diameter is 1.5cm, height is 9.5cm).