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Delivery time to the United States, Canada, Australia is 5-14 working days. This series of Jacketed Reaction Flask is made of GG-17 Borosilicate glass 3.3,with higher finish, high temperature resistance, corrosion resistance, chemical inertness. Double layer flat bottom reaction flask with three 24/40 ground glass joints. Double jacket design, with a threaded small nozzle on the top and bottom for connecting the hose. Cat.NO. Product Name KimLab CFK Double Layer Round Bottom Flask with three 24/40 Joints