Order early for pre-holiday delivery. Flinn will be closed December 24th, 2025,
through January 4th, 2026, reopening Monday, January 5th, 2026.
Orders received after 10:30 AM Central Time on Tuesday, December 23rd, 2025,
will ship after we return.
DC11632
Price: FREE
Students learn about the different types of bonding with this hands-on activity. Students follow the procedure to make a graphite circuit with a few simple materials—pencil lead, a 9–V battery, and an LED.