Featuring high transparency, these clear glass tubes and small test tubes with lids allow easy observation of contents, making them ideal for laboratory use. The leak-proof design ensures safe storage of sensitive materials like dry powders or liquid samples. Features -Color:Transparent -Material:Glass, iron -Size:7.00X2.80X2.80cm/2.75X1.10X1.10in -Capacity: 30ml -High transparency design: the clear glass tubes offer high visibility, making it easy to monitor the state of contents like dry powders or liquid samples during laboratory testing -Leakproof seal technology: these small glass vials ensure no leakage, keeping sensitive substances safe in leakproof glass lab vials for extended periods -great capacity for small samples: with a 30 ml size, these sample test tubes are ideal for dividing reagents and storing small liquid samples while meeting the needs of both chemical experiments and biological research -Portable and storable design: compact and lightweight, these mini test tubes with lids are convenient for outdoor specimen or travel use as portable glass vials -great and reusable material: made from transparent glass tubes, these vials are easy to clean and reusable, great for home, lab, or travel applications Package list: 30 x transparent glass test tube