Well made of heavy duty borosilicate glass,for chemical,thermal expansion,shock and heat resistance Designed with easier handling and more efficient storage of,biologicals,and other aqueous solutions White enamel graduations and marking spots,easy to identify and label for security and accountability Wide mouth opening allows for quick fills,commonly used as lab bottles,jars in laboratory,and home uses Linerless polypropylene screw cap to help prevent spills and evaporation