1000 ml Erlenmeyer FlaskAn excellent all around yeast starter vessel. 1000 ml borosilicate glass flask is an excellent all around yeast starter vessel. Takes a #8. 5 stopper or 35 45 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