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the kbear07 are 4,37mm in the inner diameter. the CCA 12 i have has a 5mm shaft. so that will work out i guess. my spinfits have a 7mm shaft. i glue them onto my in ears but they are too big. they fit on the outer ear and then they lose isolation when i move a bit. it's terrible.
if the kbear07 won't fit i will use them as a measure for the ones i will buy on aliexpress.