[amsat-bb] AMSAT Callsign Badge

I received my new member packet in the mail yesterday. One of the items included was an order form for an AMSAT Callsign Badge. I had also seen these on the online store and was planning on getting one. I can't find what type of fastener is used on the back. For those of you that have one could you tell me what type is used. I'm hoping for magnetic. <grin>