the stopper was released by a wooden cap with a small dowel which pushed the marble down into the neck of the bottle. if you are very thin with minimal breast tissue, silicone may be a better choice for you. if you get in your target's way while it's running, it may still take a swing or two at you. we're going to discuss your questions as soon as you call and get you set up with a meeting. we have had this faith for several years and one day we thought, why not try and get it registered? 