This AMAZING Healing tool helps to break up energy blocks which can cause discomfort, pain, disorientation, etc...  This is a natural stone that has a wonderful ability to remove negativev energy and blocks in your bodys energy meidians. This polished tool never needs cleansing or clearing but can be used to clear your other tools and stones! Within seconds or minutes this goes to work on any part of your body. the polished part is important as raw selenite can shar off and act like fiber glass when being rubbed on the body, so the polished pieces are the best way to go.  This has surpased the effects of medicine for me, where Dr.s have failed me this worked. I cannot say for sure what it can do for you, but in just seconds you would be amazed!  Some of the thickness and size can vary but not by much. Never soak in water as it is such a soft mineral it can eventually dissolve. A nice damp cloth does the trick.