[ Glass Bottle]HPLC vials have heat resistance and high chemical resistance and are suitable for accommodating reagents with acidic, neutral, and alkaline pH values [Sealed Design]Lab vials feature a unique screw design that ensures a consistent seal. Silicone septa and PTFE provide an evaporation-tight seal for compound sample storage in the chemical industry and research laboratories [Easy to Distinguish]Amber vial has white printed graduations in 0.5ml increments and a large writing area for sample identification or labeling [Screw Vials]Our 2ml HPLC vials are 12mm in diameter and 32mm in height, which is suitable for common autosampler [Wide Applications]Lab vial is suitable for HPLC, , LC/MS applications, and high-throughput analysis for reliable results. Sample vials can be used on all common automatic stamper for thin-neck bottles Specification:200PCS Colour:Transparent Material:Glass Package Contents: 200 x Autosampler Vial 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. Have a great time shopping!