i think it was the wristband from the hospital, cause matt wristband is very different from the others that were using.
a dude from the La rising.
http://cbskroq.files.wordpress.com/2011/07/img_9387.jpg
dom's was silver and more smaller.
http://kroq.radio.com/2011/07/30/photo-gallery-l-a-rising-el-gran-silencio-immortal-technique-lauryn-hill-rise-against-muse-and-rage-against-the-machine/#photo-50
Matt's one is more largest and white.