Some Senhai headphones: in-ear small steamed buns, ie40pro and other catheter plug sponge models.
Instructions: (You don’t need to apply glue to test too many earphones without falling out) Take out the old sponge with tweezers, clean the sound outlet with alcohol cotton, and then put a circle of glue on the damping end of the sponge (be careful not to coat the bottom), insert it into the earphone tube, and wait a few minutes for the glue to dry.
The greater the density, the better the dust-proof effect, the duller the sense of hearing (the more low frequencies), the greater the density, the more low frequencies, the compound balance, and the normal transparency.