Wide-neck screw thread bottles DURAN®, brown glass, 0.25 l, GLS 80 threadWide neck screw thread bottles DURAN, brown glass, 0. 25 l, GLS 80 thread Material: DURAN glass. Autoclavable: yes. With labelling space, graduations and retrace code. Large inside neck (65 mm) makes it safe to fill and remove powders, paste like media, granulate and liquids. Microwave safe. For storing light sensitive media. DURAN characteristics inside the bottle remain unaltered as only the exterior is coated; long useful life and brown colouring