1. ProteinEarphone sleevesPrevent sound leakage and fully enjoy the sound from headphones   2. Protein earphone sleeves prevents resonance between the earplug shell and otica, and relieves the discomfort of the ear mouth caused by long-term wearing of headphones.   3. Protein earphone sleeves non-slip, no ear cotton headphones are easy to fall off the ears, and it is not firm to wear. Don't look at it inconspicuous, but its function cannot be ignored. The lack of bass in some headphones is one of its shortcomings. If you don't need ear cotton, you will feel that the treble is relatively high, the bass is a little weak, and there is sound leakage. In addition, after the protein phone cover, the bass has become very real, and the phenomenon of sound leakage has disappeared, and the high school and low frequency seem to be more balanced. Therefore, if you don't feel good about the bass of headphones, don't forget to install ear cotton on your earplugs when listening to music. It can add balance to your love machine and bring you better bass expression. Package： 1 pair