Wheaton chromatography vials, 1.8ml or 0.06oz, clear, 9mm screw thread finish with ptfe /silicone liner, natural caps, type i borosilicate glass. (12×32 clear vial with natural cap ptfe/silicone septa)12×32 clear abc vials, natural ptfe /silicone caps. Abc vials and 9 mm abc screw caps are available together in convenience packs of 100. The clear and amber vials are made of type i borosilicate glass. The 1.8 ml vials are packaged in a recyclable pete clamshell case to help prevent particulate contamination. The abc screw caps are available in six colors. Warning: this product can expose you to chemicals including tetrafluoroethylene, which are known to the state of california to cause cancer. Prop 65 warning