I think that's what the ones that CA sells are made by, just marked up and not as widely available. Just do a search on Amazon for "Etymotic tips" and you'll find hundreds. Not all are the same, but in the pics you'll see the ones that have the harder center on the back to screw onto the CA speakers. I've got some of the flanged rubber ones which are not as quiet but feel great, and foam ones that are basically identical to the ones that came with the headset. Not all are made by Etymotic, but they came up in the search.