50 Clear & Clear Wide Back Cassette Boxes #CABS15CL - 4-1/4" x 2-3/4" x 5/8" (Audio Tapes, Boxes)
I've looked all over for these.  I still have many cassettes that I play, and the cases break so easily that I needed to replace my old ones.   These are good quality and now I have cassette boxes that not only protect my cassettes, but make them all look brand new.