Excellent pickups & a good price ( I imported them from Johnny) when I previously owned the RHT Sei bass - excellent bass too.
The Neck pickup is a different range - captain fingers :-
“A very tight, “fast” and highly projecting tone quality comes from this pickup, which has high timbral resolution and natural dynamics that are easily controllable with your right hand fingers. The tonal quality seems “natural” with extended lows and highs and an open and highly dynamic midrange, that can also “growl” a little bit in the lower presence area (due to “pre-aged” magnets), especially when you play very aggressive attacks.“
If I had a bass with j sized pickups in I’d buy them back 😉