This listing is for a very rare GENUINE NEW (Never Used) Toshiba MOS FET 2SK405 and 2SJ115 TO-3P (one pair). 

Those transistors you can find at many Sansui premium class amplifiers like SANSUI B-2105 MOS VINTAGE, Sansui B-2103 MOS VINTAGE, Sansui AU-α607 MOS Premium, Sansui AU-α907Limited, AU1111MOS V and other...
Maybe it is the last chance to get never used NOS output transistors for yours premium amplifier.
Every transistor will be checked BEFORE sending, so I would not accept refund or return once when the item will be shipped.
Installation of those transistors must be done by a qualified technician only because those transistors are ESD sensitive!!!!. Test before soldering, please! I do not accept any kind complaints on soldered component!!!