[High-quality Borosilicate Glass]Our vials with caps are made from premium glass, known for its durability and low expansion coefficient. This ensures that your sensitive samples are protected from any changes in temperature or pressure, guaranteeing accurate results every time. [Good Sealing Performance]The threaded screw cap of our vials comes with gasket. This provides a stronger and more reliable seal, preventing any evaporation or contamination. In addition, the 4ML vials come with scales and writing patches for sample identification. [UV protection with Amber Glass]glass construction of laboratory vials offers superior UV protection, shielding your light-sensitive samples from harmful UV radiation. Now you can store and transport your samples worry-free, knowing that their quality and integrity are preserved. [Versatile Compatibility]Autosampler vials are suitable for gas chromatography instruments. These lab vials and caps are Perfect for most standard HPLC and applications as well as high-throughput analysis.The outer diameter of the sample bottle is 45MM, the height is 14MM, and the volume is 4ML. [Products Include]providing you with an ample supply to meet your experimental or research needs. With our high-quality sample vials, you can focus on your work without worrying about running out or compromising your samples' integrity. size: 4ML Material: Glass colour: Brown Package Contents: 100 x Autosampler Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.