This is a back up hearing aid for my Right ear as I have a Cochlear implant in my Left ear. My Hybrid hearing aid that works with my Cochlear implant is in for repairs. I love the Comfort Tip dome. I am using the open dome you sent, with the acoustic part of my Cochlear. They fit very good. Will be ordering more of your Comfort Tip domes. Have less problems with ear wax with your domes.