King Solomon's amulets are unique among amulets in several ways. Solomon was a philosopher-king. There was peace during his reign and the kingdom prospered and served as a regional cultural center.
He occupied himself with problem solving and assistance through writing and other forms. As the father of the saying, "He who lives by sword shall die by the sword," he viewed every problem in two contrasting and complementary ways.
Many years before the scientific genius Sir Isaac Newton formulated his Third Law, which states that for every action, there is an equal and opposite reaction, King Solomon was aware of this fact and used it as the basis for his doctrine of amulet design.
In addition, he did not believe in one remedy or solution for all of life's problems, and thus his amulets were designed to solve specific problems such as overcoming illness, finding work, clarity of thought, becoming pregnant, etc. He viewed the issue of finding work and financial success in the wake of the job as two separate and different problems. Furthermore, according to his doctrine, the birth of many descendants requires special assistance, different from the assistance one needs simply to become pregnant and so forth. That is why there are so many amulets ascribed to him or according to his doctrine.
King Solomon's amulets are very ancient and are mentioned in the closing prayer of the Book of Formation as being of special quality.
People of other religions have also adopted Solomon's doctrines and indeed, there are non-Jewish signs on some of the amulets. The structure of a Solomon amulet is an outer layer on which mainly verses from the Torah are inscribed and an inner part, which is the operating engine. The outer layer directs the power and contains biblical verses, which offer two possibilities: success and failure. The inner layer pushes toward success.
The inner layer is composed of Torah verses as well, be they complete or composed of the first letter of each word alone.

These amulets are written in the original Hebrew writing in which the Bible was written and from the period of King Solomon (about 1000 BCE).
The reasons for include: preserving the amulet's authenticity, and preserving modesty in the call for help (prayer and calling for help should be done privately and these letters, unknown today, preserve the rule of modesty).
The original Hebrew is known for its special powers and thus it works directly on the subconscious. Many claim that it is the mother script from which all scripts evolved.

In the amulet's design, the writing is generally Hebrew but there are those that use a form of writing called "Kabbalistic writing" or, by its other name, "Angel" script.
The verses and the combinations are according to the connection to the problem or request of the person commissioning the amulet, and the assistance that the person could gain from the combinations and verses on the amulet. The person using the amulet has an important part - perhaps no less so than the person writing the amulet.
It is the very desire for the amulet and its use, and the belief in it, that help the amulet succeed - no less than its writing.

According to Kabbalah, it is forbidden for the person to be familiar with the content and the meaning of the codes in the amulet, but only the purpose for which it is intended.
This is for two main reasons:
the first because, "there is no blessing save from what is hidden from the eye"; and the second because if the person knows the amulet's contents and what is written in it, he is liable to try to interpret it in his own way or disagree with the intention or interpretation given to it by the person with special attributes.
In this way, the belief in the amulet's power would be diminished or cancelled. Thus, the amulet's power would not work for him because of the "disturbance" created by the amulet owner himself.

A person who wants to benefit from the amulet must be conscious of the fact that he is bearing an amulet and "consider" it from the moment he wears it.
The intention here is not that it will assist him in his thoughts of obtaining his desire, but that he gives the amulet a chance to help.
In practice, the person must stop feeling pressured and acting obsessively towards obtaining his goals, and become aware that there is a new factor involved to which time and soul must be devoted.

Amulets can be written on any material because the letters are the active element which create its power. However, the material has some influence, obstructing or enhancing. There are pure and compound materials (alloys), perishable and non-perishable materials.
Gold, silver, leather and copper are pure, non-perishable materials thus their energy supports the writing.

Iron, wood, stone and alloy of zinc (and others) are perishable materials which obstruct the energy of the Amulet's letters. So it is important to consider the material from which the Amulet is made.

True Amulets are made of pure non-perishable materials. Parchment is a non-perishable material which symbolizes the four elements (air, water, earth and fire) which are also what man is made of. Water - the human body is 80% water. Earth - "earth to earth" - the material part of the body. Air - the oxygen which gives us breath.

Fire - the energy which causes all the systems in our body to function properly. Parchment is the closest material to the human body because it comes from a living creature. "And out of the ground the LORD God formed every beast of the field, and every fowl of the air; and brought them unto the man to see what he would call them; and whatsoever the man would call every living creature, that was to be the name thereof" (Genesis, 2, 19).

That is why it is an excellent platform for Amulets, but the ink tends to fade with time. Among the metals there are differences between copper and gold and silver. Silver, from the sphere of Grace (Chesed), helps unconditionally (as does the moon, which belongs to the same sphere and reflects the light of the sun). Gold, however, is from the sphere of law (Din), and helps only to those who deserve help (as does the sun, which creates its own light which reaches everyone, but can harm those who are not protected). Gold will either provide very strong assistance or none at all.

Copper (also brass and bronze) belongs to the sphere of essence (Yesod) which gives and take equally thus it is a sure platform for writing Amulets. The alloy named "five metals" is considered wrongly to have special qualities.

The origin of this theory is probably with the medieval alchemists, not in Jewish Kabala. According to the Kabala the letters are most important and the material is secondary. The letters have pure, primary and powerful energy since they are the builders of the universe. The power of the material is of another kind, much weaker.

Its energy is secondary (non creative), since solid material is a result of an energetic action which changed its form naturally when created, thus the energy which emanates from a solid material is weaker (not a creative energy such as the letters have) than that of letters and its ability to influence positively or negatively is limited.
This is true regarding each and every material, including minerals and crystals.

Amulets also vary by the purpose they fulfil.
Kabbalah-Corner offers a wide range of Amulets that apply for: