This pentacle is inscribed with the seal of the fourth pentacle of Mercury on one side and the fifth pentacle of Mercury on the other side. The fourth pentacle is used for fostering understanding, wisdom, and hidden knowledge. The fifth pentacle is used to metaphorically open and reveal pathways, doors, and all available options. This is slightly larger than a U.S. quarter which makes it easy to carry in a pocket. The exact size is 28mm x 2mm.