These are the "final MAKE4 Starter Set" wired earphones, which allow for sound quality customization. I purchased them last year and have been using them for about a year, but I'm selling them to prepare for my new life. Some of the filters (D-10, F-10) have been replaced, so the quantity is slightly reduced, but there are no issues with their operation. These are excellent earphones with high-quality sound typical of final and the expandability to customize and change the sound to your liking, so please consider purchasing them.