Type 1 Class A Borosilicate Glass that are designed for maintaining anaerobic conditions. Useful for studies involving methane-producing bacteria, cell culture, drug discovery, and research and development. MADE IN THE USA.Specifications:Size: 50mLDimensions: 46mm X 88mmNeck OD: 19.7-20.2mm 13.3-13.6mmSupply With: 20mm Septum Stopper & Aluminum SealCase Quantity: 12Accessories:2048-11800 Septum Stopper2048-11020 Aluminum Seal2048-10020 Seal Crimper