RCA Pin Jack / Cover / Dust Cap / Set of 12 / Dust and Oxidation Prevention / New, Unused Purchased from an audio shop and stored. These are silicone rubber cover caps. Simply covering the jacks protects them from dust and oxidation. There are high-end metal ones of this type, but they don't prevent oxidation and can even create new rust, so these have an advantage. Please check the condition and how they fit in the photos. They can be widely used on audio equipment decks, amplifiers, PA equipment, and recording equipment. They work best when applied after cleaning with anhydrous alcohol. For those who cherish their equipment! * Philips metal protection oil has been applied since purchase. Thank you. #RCA Pin Cable #RCA Pin Jack #Pin Cable #Pin Plug #Plug Oxidation Prevention #Audio Jack Protection #Audio Terminal Protection #Audio Terminal Cover #Audio #Stereo #Component Stereo #Audio Accessories #RCA Cleaning #Pin Jack Cover #Audio Goods