Our standard thistle tubes have a stem that is 7mm in diameter and are made of borosilicate glass. This tube has a stem that is 400mm long.
WARNING: This product can expose you to chemicals 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.