What are the parts

When cleaning my beats x earphones - I accidentally took out two very tiny black parts (I believe they are like sponges or materials to filter and refine the sound) inside the tip of the beats x earphones - It fell out and was so tiny that I couldn’t find it. Apple is charging about 100 dollars to fix the small tiny part for an earphone when the product itself it only cost 130 bucks - daylight robbery to say the least. Everything else is in mint condition as I maintain it really well. Is there online or stores that may carry these two tiny parts that I can purchase.