Across International 24/40 and 34/45 Heavy Wall Round Bottom 3-Neck Flask, 10LAi 10L heavy wall, 3 neck round bottom flask with 24 40 and 34 45 standard taper joint. Comes with two vertical 34 45 side necks and one 24 40 center neck. Glass material: high borosilicate glass 3. 3. Glassware does not have warranties. Glassware may have minute blemishes that will not affect the function. If you believe there are imperfections on your glassware, please contact us. We check all our inventory and make sure no defective glassware is