WHEATON® Glass Reagent Bottles, 500mL or 88oz, Clear, 24/29 Finish, Type I Borosilicate Glass. (500 mL Bottle, Narrow Mouth Clear, Ground Glass Stopper) 500mL Glass Reagent Bottle, Clear, Ground Stopper. Borosilicate Glass Narrow Mouth Reagent Bottle with Ground Glass Stopper. Clear borosilicate glass bottle and stopper; Features no-drip pour lip