Color Classification: A: P-3.5 PP platinum + palladiumB: P-3.5 AP gold + palladiumP-3.5AP and P-3.5PP are new versions of Oyaide Denki's 3.5 mini plug series. P-3.5AP uses 24K gold + palladium as the contact pin, and P-3.5PP uses a two-layer combination of platinum + palladium plating. The pin and housing are machined from high-precision brass. All dimensions are precisely controlled in accordance with JIS standards, and we are proud of its high reliability. P-3.5AP has a dense mid-low frequency range and a smooth high frequency range. The depth of each instrument is more clearly depicted, and the gloss of the human voice is very beautiful. P-3.5PP has a wide sound range, good dynamic sound and good damping effect. For P-3.5AP, the insulating resin is red, for P-3.5PP, the insulating resin is green, and usability is taken into consideration, so even if the two are mixed, they can be easily identified. P-3.5AP and P-3.5PP make your own cables more comfortable.Brand: OyaideOrigin: JapanCoating: AP brass plated 24k gold + palladium gold \ PP brass plated platinum + palladium goldType: 3.5 mm stereo phone plugSupport wire diameter: 4mm