External components, connector shells and inserts are often metal and can be aluminum, stainless steel, brass, titanium, or even composite to meet the demanding harsh environment conditions. Today, two technologies dominate how we connect devices: fiber optic connectors (using light signals) and metal connectors (using electricity). Choosing the wrong one can mean slow internet, dropped signals, or even system failures. Whether you're upgrading a data center, designing a product, or. To properly function in so many different environments, manufacturers use all sorts of metals, plastics, rubbers, and ceramics throughout the connector to meet both interconnect and harsh environment requirements. Internal components vary in material due to performance and cost.