Josenidny 6 cm Headphone Sponge Cover, Thickened Ear Cotton Foam Microphone Cover

2. The sponge cover has three functions: on hand, it is intended to prevent slipping, on the other hand, to prevent leakage of sound, and on the other hand, a resonance between the earplug shell and the ear bone should be prevented. 1. . 6 cm (as long as diameter originally equipped with your headphones ear cotton is about 6 cm, can be used, error of 5 mm is fine, larger headphones are fine, the ear cotton itself has a certain flexibility) 3. The earplugs have small pronunciation holes. If the earplugs are inserted into your ears or placed outside, it is very likely to get through these small holes into the earplugs. The earplugs have a very thin membrane, only a few microns, a little changes the vibration membrane, affects sound quality and even damages the earplugs. The cotton ear plugs can prevent these external residues from entering the membrane earplugs and protect the earplugs. In summary, the sponge cover of earplugs is very useful, please stay with it