Cast Iron. 3 inch diameter. The pentacle is a symbol of protection. Most religions on Earth attributes special powers to number 5, which represents the human body; 5 senses, 5 elements, 5 pillars etc. There are also 5 virtues; Love, Wisdom, Truth, Kindness, Justice. It is in the efforts that we make to manifest these 5 virtues that the Divine protection usually attributed to the pentacle becomes effective. Long ago, it was considered by Pythagoreans as a symbol of beauty and harmony.