This is the L-508 Sound Library issued for the Roland S Series Samplers.  These disks are in Roland S-50 format and will load onto a sampler that can read this format.

This disk can also be used in the Roland W-30.

There are 5 disks in list library:
X6-S050-36: Western Strings Vol. 1
X6-S050-37: Western Wind Vol. 1
X6-S050-38: Middle Eastern Percussion Vol. 1
X6-S050-39: Indian Wind & Thai Gong Vol. 1
X6-S050-40: Gamelan Vol. 1