Gold-plated plug, good contact performance, not easy to oxidize. Thickened solder pad and thickened fixing clamp shall be used for connection point. Plug with M6 x 0.5 internal thread, special interface for wireless microphone, gold-plated plug, oxidation resistance, stable contact performance. For D12 / D21, for , for and other Lavalier wireless microphone, with M6 internal thread special plug. The shell is a metal shell with an assembly design, which is convenient for welding and assembly. strong and sturdy. type: 3.5mm Audio Plug color:Black+gold Material:Metal+gold plating Package Contents: 25 x 3.5mm Audio Plug Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.