This listing is for 12 "SP6" larger sleeves used in "F" series Siemens Siplace machines. These are from the refurb stock that did not ship out with the machines during a recent plant shutdown. 8 of these look to be used but in fine condition, 4 are in containers marked with various failure modes like "damaged" or "will not calibrate" or "will not reference". The non-useable units should be able to be sent in for refurb, which would be much cheaper than buying new sleeves.