Wx-noiz12-w High Quality Middle Empty Foam Pad Earbud Earpad 12 Pack Sponge Cushion Covers for Stereo In-ear Headphones , Headsets / [White] Replacement Foam Pad Earpad Cover Cushion /12 Pack [White] 1. Functions of Sponge Cover A. Anti Slide: Prevent the earphone from falling off when enjoying music. B.Anti Leak: Minimize sound leakage by using spongese cover, as all earphone have trouble with the problem of leakage. C. Safe and Comfortable: stop direct contact between earplugs and ear bones in order to avoid any possible allergy and discomfort. 2. Improvement and reinforcement: effectively adjust volume to protect from damage caused by high pitch. Also, reinforce low pitch and improve sound effect. 3. Extend earphone durable life: lots of tiny holes are in earplugs and long-time explosure to air make it full of sticky dust which will affect vibration membrane and sound qaulity, even damage earplugs. Sponge cover can prevent dust and dirt into earplug so as to extend its service life. Top quality and made by environment-friendly material