Ai 35/20 standard taper joint, heavy wall 1000mL round bottom receiving flask.
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 sent to our customers.