Cayin PH-32X is a high quality adapter that let's you connect balanced HiFi Headphones to a broader variety of sources 3.5mm male to 2.5mm female: Connect any 2.5mm balanced plug to devices with 3.5mm terminal. The solid base is CNC machined magnesium alloy and stainless steel offering integrity and durability for a lifetime of use. Perfect Sound Transmission PH-32X adopts high quality materials to transmit signals at the best quality, providing maximum stability of connectivity and loss of transmission. The L-shaped design protects against damage during long periods of use. Specifications Size: 0.4 x 1.1 x 0.9 inches (9.5 x 28 x 25 mm) Weight: 0.18 oz (5 g) Material: Magnesium alloy, stainless steel (body), gold plated audio jacks and sockets, and silver plated monocrystalline copper inside.