This flipper topper is made to go with the mini playfield on Guns N Roses JJP. I sculpted the skulls to match with the ones that we designed for the Axl figure in the game. They are cast out of bone resin and given a brown/black wash like the originals. They attach to the top of the flippers via VHB tape. We recommend that you clean the tops of your flippers with rubbing alcohol before install.