The trick was to make them as fancy and bling looking as possible, so they would catch the visitor`s eye. Upon turning the coaster around it will tell you if you won or not, if not we had some nice messages there as well. As being such nice pieces the idea was also to take some home, if he/she was lucky in finding one and to keep them on the shelf as a reminder of good time she/she had.
The Block Fest itself is the biggest nordic HipHop Festival, here is a link to the line-up they had over the years. The coasters were hand printed and manufactured by Walter Kucher at Hofgarten Manufrakturin Bonn Germany, limited to 999 pieces.