These straight connecting tubes are made from glass, have a 6mm outer diameter, and have constrictions on its ends to help rubber tubing stay attached.
Sold in a pack of 10.
PRODUCT WARNINGS
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.