I upgraded a Tario fretless bass with these pickups.The stock pickups on the bass had very very low volume, and no tonal response when turning the tone or volume knobs on the bass. The Artec pickups were an inexpensive way to troubleshoot the reason the bass sounded so BLAH.These pickups immediately brought tone and volume to the bass. It came alive. For $38 off AMAZON. They won't compete with Seymor Duncans, or EMGs, or Bartolini, but for only $38, they brought life to an otherwise door-stop of a bass. They're not bad. Especially if you're not afraid to change your usual amp EQ settings. I use a Sushi Box preamp (pedal) with these and they sound great. Just my opinion.