Cover all the unused RCA inputs in your system with the RCA caps and keep this noise from into your components. RCA caps slide right over unused RCA jacks and will both sonic and environmental protection. This Noise-Stopper caps are grounding plugs that help you block out this unwanted noise. Just a cap over the open inputs on the back of your Hi Fi gears. You will aware Noise-Stopper caps lower the noise floor and allow your equipment to to it's fullest potential. For elimination of electromagnetic noise pick-up from unused RCA connectors in Audio vedio Equipment protector dust proof. Gold Plated brass to ultra and protection. against RFI, EMI dust and corrosion. Suitable for either shorting or non-shorting application. colour: gold Material: copper gold-plated Package Contents: 10 x RCA Socket Protect Cover Caps Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.