zinc alloy Imported Post closure Lens width: 4 millimeters Machine Wash Celebrate the wonders of space exploration with this NASA 4-piece lapel pin set. Each pin features iconic designs, including the NASA logo, the NASA text logo, a space shuttle, and an astronaut. Made from durable zinc alloy, these pins measure 55 x 33 mm and are perfect for showcasing your love for space and science. Wipe them clean with a soft cloth for easy maintenance and keep your space passion shining.