These fantastic shot tubes can easily be used as a stand alone piece or within a display. Maximum 30mm bore size . Effect 1 - silver mine lift to a huge red tipped golden brocades. Effect 2 - big silver mine lift to silver brocade and sizzling spiders. Effect 3 - crackling silver mine lift to a multi coloured tipped sizzling silver brocade Effect 4 - strobing silver mine lift to purple and green pearls finishing with a sky filling red and gold strobing star effect.