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. 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.