The metal plug of the audio cable is essential for sound transmission. If the plug gets or oxidized, it will impair the sound quality, or even unusable. The main cause of plug oxidation and rust is the oxygen in the air, so the to protect it is to isolate the oxygen and seal the plug well. Material - silicone (elastic, airtight, and durable) Double-step design of the inner hole - compatible with mono and stereo plugs of 6.5MM and 3.5.MM A Strap is included for convenient storage and organization of the wires. Suitable for - all 6.5MM and 3.5MM audio cables, wireless transmitters, etc. Part Name:Cable Plug Protective cover Weight:.11g Colour:black Material:Silica gel Size: 7.7 x 2.7 x 2.4cm Package Contents: 1 x Cable Plug Protective cover 1 x Cable tail Fastener 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.