Rattlesnake Eggs: polished barium-strontium ferrite ceramic magnets influence each other when many centimeters apart, demonstrating the well known but mysterious action at distance via magnetic fields. Sometimes sold as “buzzers” these magnets come together with multiple bounces creating a characteristic zipper sound. Many shops and online vendors incorrectly label these as hematite- a completely different substance that does not magnetize well. ➡️ Follow the link in my profile for info on where