Set 6 8 oz size 4 of the 6 have a cap, the other 2 are missing the cap I hand scrubbed to clean and then ran through the dishwasher. You’ll see water marks from dishwasher. I recommend to boil before using. I have found that after boiling the Comotomo bottles, you need to make sure the vents in the nipple didn’t get stuck together. I usually just rub my fingers over the vents after boiling to make sure the vents are working properly. We are a smoke free, pet-friendly home. I am just hoping to find someone that can use these bottles. If that’s you, please let me know and make an offer.