It adds strength to your emotional, mental, spiritual and physical stature. Also, it is used for concentration.
 
Large: Height is 1 inch, length is 2.5 inches, and width is 2.5 inches. Weight is 4.40oz.  
Small: Height is 1/2 inch, length is 2 inches, and width is 2 inches. Weight is 1.70 oz.