Advertise that your love for science isn't just relative, but extends throughout spacetime, as a matter (or energy) of principle! Colorful enamel pins feature physics' most recognizable face (Albert Einstein, of course) and a rectangular chalkboard with his famous equation E = mc². Wear them together or mix & match.
Each pin is about 1.25 inches wide with rubber pin backs. Designed in Brooklyn, NY, USA, made in China.