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This is a set of 9 Digital Equipment Corporation RX01 8" floppies from 1981 that supposedly contains the binaries for RT-11 V4.0.
7 are labeled "RX01 1/7", "RX01 2/7", ... "RX01 7/7", and one is labeled "RX01 1-T/7", whatever that means. A 9th floppy was originally a blank with a hand-written label that says "BASIC DISTRIBUTION BACKUP". The labels can be seen in one of the pictures for this listing.
I don't have the means to verify readability, but I don't think these floppies got much use at all. The blue plastic case is in excellent shape. Some spare labels are also in the box.