headspace sample vial with graduation marks restek-Lab Scientific amber Crimp Neck GC Vial Restek Material: USP Type 1, Class A, 33 Borosilicate Glass Dimensions: 22 x 38mm/22.5 x 46mm/22.5 x 75mm Application: GC system Life Sciences Amber 20Mm Gc Vial Restek-Aijiren Headspace Vials