Made of rigid but bendable metal. Activated by squeezing the parallel sides inwards. Safe because the sharp needle tip is covered when the pin is closed. Originally from the Mycenaens circa 14th century B.C.. Re-invented in July of 1849 by American Walter Hunt. Adopted in the mid 1970s by the punk subculture. If you want to credit one person for its punk birth, thank Richard Hell of the Voidoids. Easy to use & inexpensive & strong & safe & shiny & D.I.Y.. Friend, you have the whole world in your hands.