2000 ml Erlenmeyer FlaskAn excellent all around yeast starter vessel. 2000 ml borosilicate glass flask makes an excellent all around yeast starter vessel. Takes a #10 stopper or 46 50 mm foam stopper for optimum fit, especially when propagating yeast, we highly recommend using a foam stopper. California Proposition 65 Proposition 65 Warning: This product can expose you to chemicals that are known to the State of California to cause cancer and birth defects or other