These are antique glass and sterling silver. You add your voodoo powder to them and charge it up 300 times!!!!!!! OMG! We have been testing these on and off when one of us gets a chance to do so. We are amazed and you will be too! These are a must have and they shake out just the right amount to set your world on fire.
See the YouTube video: http://www.youtube.com/watch?v=h1VX7cciRis