These chromatography abc vials and 9 mm abc clear 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