Enough metal however to make airline security question them from time to time. I remember when I started playing over 10 years ago they though I was trying to smuggle something through securtiy. Forntunately, enough people travel w/ discs these days that they are becomming more familiar with the sport. I remember thinking that if they took my bag I might go postal on the spot.
Well, that could be explained by the metallic stamps. And plastic does show up in x-ray machines.