These 12 x 32mm polypropylene vials can be used in most standard gas and liquid chromatography autosamplers. Lightweight, economical vials are made from durable polypropylene for good chemical resistance. The conical interior ensures maximum retrieval of contents without the hassle of using removable inserts. Vials have snap/crimp finish. Packaged 100 per shelf pack and 10 packs per case.