The borosilicate Cover Glasses have fire-polished edges and a concave shape. These watch glasses have a diameter of 50mm. .
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.