Instant Alert: Here’s the surprising reason why pen caps have a small hole at the top

MANAGE SUBSCRIPTIONS   |   UNSUBSCRIBE   |   VIEW ONLINE   Here's the surprising reason why pen caps have a small hole at the top by Emma Fierberg and Jessica Orwig on Sep 3, 2016, 1:23 PM Pen caps have a small hole to prevent choking if swallowed and to equalize the pressure inside the pen to keep it from leaking. Produced by Emma Fierberg. Original Reporting by Jessica Orwig. Follow BI Video: On Twitter   Share the latest business news with your network: Email sent to:   |   Manage your email preferences   |   Unsubscribe Terms of Service   |   Privacy Policy Business Insider. 150 Fifth Avenue, New York, NY 10011