Material: Natural Gemstone Package: Pack of 2 Size: approx 1.88" long x 1.5" wide x 0.3" thick, a 2-3mm's variation will be normal. Every piece is natural and unique,we will send one(s) similar as pictures shown, carvings may slightly vary in size, color. Handcarved, smooth, perfect as Pocket/Worry/Palm/Thumb/Energy Stone Using a worry stone is very easy. All you have to do is place the flat stone in between your thumb and index finger. Rub the stone by using your thumb so that the continuous motion activates the nerves situated at the base of your thumb that results in releasing natural endorphins. This, in turn, induces a sense of calmness and relaxation in the body and mind. You will get peace and positive emotion and healthy life.