These quality round bottom boiling flasks are made from heat-resistant borosilicate glass, and have 24/40 ground glass joints and thick walls.
WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Our products are not toys. Use in a laboratory or educational setting only. Not for children 13 and under.