Screw Neck 2ml HPLC Vials are mainly made of glass and are rarely plastic.If you use an autosampler, choose the Screw Neck 2ml HPLC Vials for your specific equipment brand. 1.5mL 8-425 Screw Neck Vial ND8 1.5mL 9mm Short Thread Vial ND9 1.5mL 10-425 Screw Neck Vial ND10 1.5mL 11mm Snap Ring Vial ND11 1.5mL 11mm Crimp Ring Vial ND11 4mL 13-425 Screw Neck Vial ND13 1mL Shell Vial