The following is an overview of the categories of materials that are supported in this Companion Specification:

Provides the physical structure to support and protect connectors and wires, often made from durable plastics or metals.

The component within a connector where the wire is attached, which can be designed for crimping, soldering, or other types of connections.

Materials used to prevent moisture, dust, and other environmental contaminants from affecting the connections and components within the harness.

Flexible, often tubular, material that is used to bundle, protect, and insulate wires within the harness, available in various materials for different protective qualities.

A conductor, usually covered with an insulating material, that is used for carrying electrical current or signals.