Plastic test tubes for laboratory testsRound bottom with screw top on the topPerfect for samples, food colors, craft use etc. These were designed for use asCentrifuge tubes made and are therefore leak proof.The non-wetting inner surface eliminates concave menisci, more measurementsPlastic test tubes for laboratory testsThe change from glass cylinders to the plastic equivalent Globe severely reduces breakage and the potential for injuryChemically resistant to acids, bases and many common solventsTest tube height: . 10cm / 3.94inchBottleneck diameter: . 1.2cm / 0.47inchBottleneck outside diameter: about 1.5cm / 0.59inchMaterial: PlasticTest Tube Color: TransparentCap color: bluePackage Included:20 x plastic test tubesOnly the above package content, other are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.