When selecting bra accessories such as hooks, eyes, adjusters, and underwires, you must prioritize material durability and skin safety. For metal components (hooks and underwires), ensure they are nylon-coated or stainless steel to prevent rusting and skin irritation. For elastic straps and extenders, the stretch recovery rate should be tested to ensure they do not lose elasticity after repeated washing. Additionally, verify that all plastic adjusters are made from high-density POM or nylon to prevent snapping under tension.