https://phoenix.craigslist.org/evl/bop/d/phoenix-sunrace-csm990-wide-range-speed/7918367643.html
SunRace CSM990 Wide range 9-speed MTB Cassette 11-40t 11-42t - bicycle parts - by owner - bike sale...
These are all I use, after using Shimano and SRAM which don't last nearly as well. CSM-990, 11-40T or 11-42t and work well with older derailleurs with a...