You can ensure long-lasting, low-resistance electrical connections by selecting high-quality materials. When a connector is manufactured, a die stamps it repeatedly. This helps to cut and form the metal, but it also “work hardens” it, making it brittle and difficult to form. Annealing returns the copper to a softer, more malleable state. The barrel portion of higher-quality connectors appears seamless because it’s actually welded or brazed together, which means that it can be crimped at any point around the barrel without bursting. Ideally, the inside portion of the barrel includes serrations, which are designed to cut into and take hold of the wire as the crimp is made, ensuring a good mechanical—and electrical—bond. Once the connector is stamped, cut, and annealed, it’s then tin-plated, yielding superior corrosion protection.