Transparent Screw Top Glass Vials Transparent Screw Top Glass Vials, made by borosilicate glass. Excellent sealing and chemical resistant for PTFE/Silicone septum. Deep Amber Color Screw Top Tubular Glass Vials Screw Top Tubular Glass Vials, popular specification covers 2ml,4ml,5ml,7ml,10ml,15ml,20ml,25ml,30ml.Applicable for lab test purpose.