3. DWK Life Sciences Reagent Bottle, Narrow Neck, Soda-Lime Glass, Clear, Standard Taper Ground Joint Neck. Classic narrow-neck, glass-stoppered reagent soda lime glass bottles. 4. Pyrex™ Borosilicate Glass Narrow Mouth Reagent Bottles with Glass Stopper. Store reagents, analytical standards and culture media in these glass reagent bottles.