You can buy them from her site too.
http://wwwsharonschambernetwork.com
They come with two plastic bottle tops, and three different sizes of the metal tips that screw onto the plastic ones. I have used mine this afternoon, and its great. Gene, her husband, even sent me some of the glue, as I couldn't find any USA site that would ship reasonable quantities overseas. You can get some on ebay, but the shipping was astronomical.