Yeah, it's like two picks in one. I thought he uses this special pick because if you watch the "speed lives" video, he angles his hand differently when he shreds. I have attempted to do that with a normal pick, but with that angle, it's impossible to get a sound.
But Michael Angelo is a crazy guitarist overall. He invented the Quad Guitar and the Double Guitar. He's the only guitarist that has mastered playing the Double Guitar; playing both necks at once (ambidextrous).