Kimble 14395-500 Borosilicate Glass GL-45 Media/Storage Bottle With Blue Polypropylene Screw Thread Cap, 500mL (Case of 10) Enhanced graduations and marking spot made with chemically resistant white enamel paint 30 mm ID opening Replaceable clear (natural) drip-free polypropylene pour ring and linerless blue polypropylene GL 45 screw thread cap included on each bottle Autoclavable Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements