Built from-the-ground-up to be a unique beast, the 5SDD4SET Soapbar Style Pickups for 5-String Bass Guitars from Aguilar is compatible with the Bartolini P4 and features two rows of Alnico V magnets that come together to create a big, thick, and growly tone. Complete with hum-cancelling performance, this pickup is the perfect blend of strong dynamics and rich overtones.