25/10/2020 · 2ml Autosampler Vials with Caps & Writing Patch, Graduations (White PTFE/red Silicone Septa) 1.Vial is made of 5.0 neutral Borosilicate Glass, with Graduations and writing Patch for sample identification. Amber vials can protect light-sensitive samples. 2.9mm Blue ABS screw cap, unique thread design, and can be reused, easy to use.