My good friend Dan Hawkins designed this as a patch, so I had it made into a pin. It really doesn't need an explanation. The pin is large at 1.5" in diameter and has 2 posts on the back to keep from swiveling. It is hard enamel (cloisonne) and is extremely well made. It will be available shortly at www.vietvetpx.com for $6.99 plus $2.50 shipping