Sony | Noise Isolation Earpiece for earphone EP-NI1000 M/L

The use of a proprietary polyurethane foam material (material and composition ratio are uniquely adjusted) provides high sound insulation and stability, thanks to the material's special adaptability.

The unique construction of the foam makes it soft but smooth and easy to apply.
The force acting in the direction of the earpiece retention ensures high wearing stability.

Compatible models:
All Sony in-ear earphones except models with Arc Supporter (see picture) such as Walkman WS series and sports models.

Precautions when wearing:
The earbuds fit more snugly to the ear, which may increase the strain on the ear. If you feel any discomfort, discontinue use. Do not pull only on the urethane foam part. If it separates from the earpiece, it will not function. Do not leave the urethane foam part of the earpiece in place for long periods of time with force applied to it. Do not leave the urethane foam for long periods of time as it may deform and become difficult to return to its original shape. The foam material may become hard when the temperature is low. Warm it slightly by hand before use.

Precautions for care:
If the earpieces become dirty, do not wash them in water, but wipe them gently with a dry cloth to remove them. Do not use alcohol or similar substances. Do not use alcohol, etc. in this case, as it may cause premature deterioration. If the earpieces are wet, drain off the water and make sure they are dry before use or storage.

Other precautions:
Foam materials deteriorate after prolonged use and storage.
Replace the earplugs as they will not function as well as they should.
When wearing, a crackling sound may be heard in the ear, but this is not abnormal.
The size of the holes in the urethane foam does not affect the sound quality.
The urethane foam may be slow to recover if the air temperature or operating temperature is high.
If the original sound quality can no longer be felt, replace it.