A "Prince Rupert's Drop" is molten glass dropped into cold water to form a kind of tadpole shape, with a bulbous head and long thin tail.
They have really weird properties, breaking the thin tail is easy, and causes the glass to shatter violently; however the bulbous section has immense strength.
If you were wondering just how strong they can be, check this out (timestamped for when the press starts crushing).
View: https://youtu.be/vZh_XSQ5WVU?si=NV0a1NCmMsQ_0yJ0&t=90
They have really weird properties, breaking the thin tail is easy, and causes the glass to shatter violently; however the bulbous section has immense strength.
If you were wondering just how strong they can be, check this out (timestamped for when the press starts crushing).
View: https://youtu.be/vZh_XSQ5WVU?si=NV0a1NCmMsQ_0yJ0&t=90