I installed the two parts sent. However, please read my reason for buying quality earphones from the retailer. The double sided tape was not centered on the back of the inserts. There was no easy way to remove the red stripe from the 2-sided tape. It can also be seen that one of the inserts did not have full tape but used two pieces. I guess they got to the end of the role. I give the installation 3 stars because it is difficult to remove the red bar. I put 1 star for liability as I don't know if it will stay or not.