Single core wires
inflexible
Single-coated and double-coated non-flexible wire
The important thing when buying a single-core wire is that its conductor is 100% copper. The weight of the wire and cable will not always be a measure of its high quality. Buying copper wire is recommended for people who want to use the best wire for fixed installation. You can also use it as internal wiring in dry places. Please note that this type of wire should not be used directly under the wall.