Resistors, ceramic condensers, folio condensers, coils, diodes, circuit boards, MP/IC/EPROM, nylon covered silver and gold coated wire, silver wire, copper wire, metal thread, and thread from leather.

Jewelry locks, ear hooks, ear clips, wire clasps, and other accessories are made from 925 silver or nickel-free metals.

Although circuit boards will emit poison if burned, normally these components are harmless to use and should not cause any allergic reactions.