Reed switch is hermetically sealed inside the sleeve, the plug circuit is broken before the plug is completely inserted into thesocket,there will be no ear-piercing noise when inserted into the ampliffier, Sleeve is made of 62# brass with thickness of0.3mm-0.45mm, more durable and abrasion resistant. The screw thread is manufactured with numerical control machine,making the connection perfect fit and seamless, Plated with Peral Nickel, the appearance is more shiny and abrasion resistant.