The funnel diameter of this thistle tube is 20mm. The stem is 4mm in diameter and 250mm long. It is made from borosilicate glass.
WARNING: This product can expose you to chemicals including arsenic, 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.