Specifications:The transparent test tube is made of glass and it is strong and not easy to break.It is harmless to the human body, safe and eco-friendly.Featured with small-capacity, the clear test tube can be used for scientific experiments, planting hydroponic plants, etc.Type: Test TubeMaterial: GlassTest Tube Wall Thickness: 0.9mm, 1mm, 1.1mm, 1.2mm, 1.5mm, 1.3mm, 1.7mm, 2.1mmProduct Specifications: 1: 10 x 75mm, 2: 12 x 75mm, 3: 15 x 150mm, 4: 18 x 180mm, 5: 20 x 200mm, 6: 30 x 200mm, 7: 32 x 200mm, 8: 40 x 200mmFeatures: Portable, Durable, Experiment InstrumentTest Tube Diameter: 10mm/0.39", 12mm/0.47", 15mm/0.59", 18mm/0.71", 20mm/0.79", 30mm/1.18", 32mm/1.26", 40mm/1.57" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Test Tube