Carolina Biological Supply Company Red Magnetic Leads, 11-3/4", Pack of 10

Magnetic leads work in all places that standard clips work because the leads have a tiny yet powerful permanent magnet on each end to create an instant connection. This makes magnetic leads compatible with traditional classroom circuit components.
The benefits of using magnetic leads:
Cannot easily pull off the end, rendering the lead useless
Perfect for hands that have difficulty gripping and squeezing alligator clips
No pinch hazard
Place end to end to quickly extend the length
Connect batteries without battery holders Note: Contains magnets. Lead length, 11-3/4" (295 mm); magnet diameter, 4 mm. Pack of 10. Red.