The reason I want the size of the CK-12 is because I took the brass CK-12 out of an old "EB" and put it in an AKG "the tube". So the old EB is a good candidate for checking/hearing what quality this new company puts out. as for disecting and getting inside, I would rather someone with qualifications do that. I requested samples, they agreed and asked "what sizes?" So,,,, CK-12 = ?