This is Kinnikuman: Kinniku Man M.U.S.C.L.E for the Famicom Disk System, a Japan-region, Japanese-language release.
It's used and has been tested working — the disk is in good condition, and the plastic case has some scratches.
This copy has been tested on multiple Disk System consoles, and it will be tested again before shipping. If it doesn't read on your machine, that generally points to a head-alignment issue with your own Disk System unit rather than the disk itself, so please only buy if you're comfortable troubleshooting that yourself.
