1. Built-in memory foam, soft and elastic
2. The real machine opens the mold, close to the earphone, stable and not easy to fall off
3. Easy to replace
4. Good air permeability, not easy to crack
5. Meet the daily wearing needs, no pressure
6. Compatible models: for Sennheiser PC37X PC38X HD515 HD555 HD595 HD518 HD560s HD569 HD579 558 599