Screw neck bottles, DURAN®, amber, w. pouring spout ring and cap, PP, 50 mlScrew neck bottles, DURAN, amber, w. pouring spout ring and cap, PP, 50 ml Material: DURAN glass. Autoclavable: yes. Amber coloured with unaltered DURAN characteristics inside the bottle as only the exterior is coated. Long useful life and brown colouring has good chemical resistance. Light protection: absorption in short wave range up to 500 nm. With DIN GL thread and pitch Bottles up to 25 ml, with a specially shaped glass edge, so no pouring ring