Suitable for headphones:

Sennheiser PX360 PX360BT MM550-X MM550

Designed to enhance the fidelity of your audio by cushioning the vibrations between your ear and the headset， providing more vibrant sounds.

Headphones sponge sets， in general， I recommend replace earpad every three to six months. Lot of people are not used deliberately to clean earpad，
however product will contact with the secretions of face， secretions  paste in headphone earmuffs， a long time it will breed a lot of bacteria，
is likely to cause skin allergies， cross-infection and other diseases seriously affect health.

The Price is for one pair ( left and right)