Vial kits combine vials and caps with septa for your convenience. Resealable box helps prevent contamination during use. Constructed with silicone/PTFE septa for contaminant free sampling. 2-mL size ideal for chromatography applications. Contructed of amber glass for light sensitive samples. UltraClean silicone/PTFE septa are optimized for gas chromatography and headspace analysis.