Pack of 100 WQP-PJ398S-BM "Erthenvar" vertical mount
3.5mm mono switched jacks.
The WQP-PJ398S-BM is QingPu's latest update to the
PJ301BM (commonly referred to as Erthenvar jacks). It is
the same footprint and visually identical to the PJ301BM,
however has a stronger bushing made of beryllium copper
to prevent damage to the jack when too much pressure