They are all sets of 2-drivers.
I thought this was fairly intuitive since the titles of all listings state "drivers" (plural) and each item has at least 1 photo indicating 2 drivers. Albiet some of the 2nd drivers remain in a box.
I didn't use the word "pair" though. For me a "pair" indicates and measured and matched set of drivers. These were all purchased on the same production run and should be very similar. Indeed all of these drivers are well manufactured, but none of them are measured and matched from a larger batch of drivers.
Dave